Senses and Sentences: Verbs of Perception
Grammar Rule in 30 Seconds
Use the base verb for a completed action and the -ing form for an action in progress when using sensory verbs.
- Use the bare infinitive (no 'to') for finished actions: 'I saw her cross the street.'
- Use the -ing form for ongoing or partial actions: 'I saw her crossing the street.'
- Never use 'to' after perception verbs in active voice: 'I heard him sing' (NOT 'to sing').
Overview
English helps you talk about what you see or hear. You can show how you saw it. Did you see the whole thing? Or did you see just a part?
This helps you tell a better story. You can describe a finished event. Or you can show something still happening.
Good speakers use this to speak clearly. You can show a quick picture. Or you can show a whole event.
This helps you say how you see things. You choose between two word types. This gives you more power when you speak.
How This Grammar Works
I saw the boy jump over the fence.(I witnessed the entire action: he started on one side and landed on the other.)We all heard the CEO announce her resignation.(We heard the complete announcement, from start to finish.)She felt the needle prick her skin.(She experienced the single, complete sensation of the prick.)
I saw the boy jumping over the fence.(I saw him in the middle of the act; perhaps he was already in the air when I looked.)When I walked past her office, I heard the CEO announcing her resignation.(I caught a part of the announcement as it was happening.)She felt the rain falling on her face.(She experienced the continuous, repeated sensation of the rain.)
I watched the artist paint the portrait.(Implies I was there for the whole process, from blank canvas to finished work.)I watched the artist painting the portrait.(Implies I observed for a while, focusing on the activity itself, without necessarily seeing the start or finish.)
Formation Pattern
see: Did you see the car crash? / I saw the car crashing.
hear: I heard the baby cry. / I heard the baby crying.
watch (implies more focused attention): We watched the team win the final. / We watched the team winning.
notice (implies becoming aware): She noticed a man stand up. / She noticed a man standing in the corner.
observe (more formal than watch): The scientists observed the cells divide. / The scientists observed the cells dividing.
feel: He felt an insect crawl up his leg. / He felt an insect crawling up his leg.
smell, listen to, look at
They saw the suspect enter the building. | They saw the suspect entering the building. |
The suspect was seen to enter the building. | The suspect was seen entering the building. |
When To Use It
- 1Eyewitness Reports vs. Scene Description
- Report:
The officer saw the driver ignore the red light.(A complete, observed violation.) - Description:
From my balcony, I could see cars ignoring the red light all evening.(A repeated, ongoing process.)
- 1Highlighting a Sudden Event vs. a Background Process
I was sitting in the park, watching the ducks swimming on the pond. Suddenly, I heard a dog bark aggressively and saw a man fall.(The swimming is background; the bark and fall are key plot points.)
- 1Emphasizing Process vs. Result
I spent the afternoon watching my neighbor build a fence.(Focus on the finished product: a new fence exists.)I spent the afternoon watching my neighbor building a fence.(Focus on the activity: hammering, sawing, and working.)
- 1Describing Short, Repeated Actions
I felt my heart beating rapidly.(A continuous, repeated action.)He watched the warning light flashing.(The light blinked multiple times.)
Common Mistakes
- 1Using
toin the Active Voice
- Incorrect:
I saw him to take the last cookie. - Correct:
I saw him take the last cookie.
- 1Forgetting
toin the Passive Voice
- Incorrect:
The suspect was seen enter the bank at midnight. - Correct:
The suspect was seen to enter the bank at midnight.
- 1Mismatching the Form and the Meaning (Aspect Confusion)
- Confusing:
As I drove past the stadium, I saw them play the entire match.(This is impossible if you only drove past.) - Logical:
As I drove past the stadium, I saw them playing the match.(You saw them in the middle of the game.)
- 1Using the Wrong Verb Form
- Incorrect:
We heard them sang a song.orShe felt the floor shook. - Correct:
We heard them sing a song./We heard them singing a song. - Correct:
She felt the floor shake./She felt the floor shaking.
- 1Forgetting Prepositions with
listenandlook
- Incorrect:
I listened the man talk./He looked the birds fly. - Correct:
I listened to the man talk./He looked at the birds fly.
Real Conversations
These forms are ubiquitous in everyday English. Seeing them in context reveals their natural flow and communicative power.
Scenario 1
A: Did you see Chloe leave the party last night? She just vanished.
B: No but I saw her arguing with Max near the kitchen earlier. Looked pretty heated.
A: Oh wow. I heard him shout something as I was getting my coat, but I didn't see what happened.
Scenario 2
Team, has anyone seen the final metrics report come through? I noticed Sarah working on it this morning, but I haven't seen an email arrive yet.
Scenario 3
I'll never forget my first morning in Kyoto. I just sat by the window, watching the city wake up. I could hear the temple bells ringing in the distance and saw commuters hurrying to the station. A truly magical moment.
Scenario 4
At approximately 22:40, the witness observed the vehicle approach the intersection. He states that he saw the car fail to stop at the red light and heard it accelerate through the junction.
Scenario 5
A: The effects were amazing. There's a scene where you feel the whole cinema shaking.
B: I know! And did you see the hero make that impossible jump at the end? I literally heard someone in the audience gasp.
Quick FAQ
I saw him cross the road and I saw that he crossed the road?This is an excellent question about direct vs. indirect perception. I saw him cross the road means you directly witnessed the action with your own eyes. I saw that he crossed the road means you came to know the fact, perhaps by seeing him on the other side afterwards. The that-clause reports information; the perception verb structure reports a sensory experience.
-ing form too?Yes, and it's much simpler than the infinitive form. The -ing form does not change in the passive. For example: He was seen running from the scene. This is grammatically correct and very common for describing an ongoing action perceived of a passive subject.
It's not random. It's part of a larger pattern in English grammar. Certain verbs that express a direct influence or perception, like make, let, have, and verbs of perception, form a very close connection with the action that follows. Dropping the to grammatically reflects this directness. Think of it as removing any distance between the perception and the action.
The nuance is subtle, but yes. Using the bare infinitive (We observed the subject exit the building) can sound more clinical and definitive, as if reporting a complete, logged event. This makes it common in formal, factual reports. The -ing form (We observed the subject exiting the building) is often more descriptive and narrative, focusing on the unfolding action, making it very common in storytelling and everyday conversation.
watch, see, and notice?These verbs carry different shades of meaning. See is the most general and can be unintentional (I saw an accident). Watch implies sustained, intentional viewing (I watched the movie). Notice implies becoming aware of something that you might not have been looking for (I noticed him looking uncomfortable). This can influence your choice of form; you are more likely to watch someone playing a game (duration) but might notice them flinch (a single, quick action).
Active vs. Passive Perception Patterns
| Voice | Perception Verb | Object | Complement Form | Example |
|---|---|---|---|---|
|
Active
|
saw
|
him
|
Bare Infinitive
|
I saw him leave.
|
|
Active
|
saw
|
him
|
Present Participle
|
I saw him leaving.
|
|
Passive
|
was seen
|
-
|
To-Infinitive
|
He was seen to leave.
|
|
Passive
|
was seen
|
-
|
Present Participle
|
He was seen leaving.
|
|
Active
|
heard
|
the bell
|
Bare Infinitive
|
I heard the bell ring.
|
|
Active
|
heard
|
the bell
|
Present Participle
|
I heard the bell ringing.
|
Meanings
Verbs of perception (see, hear, feel, watch, notice, smell) follow a specific pattern where they take an object followed by either a bare infinitive or a present participle to indicate the state of the action being perceived.
Completed Action (Bare Infinitive)
Used when the speaker perceives the entire action from start to finish.
“I saw the magician disappear.”
“We heard the bomb explode.”
In-Progress Action (Present Participle)
Used when the speaker perceives only a part of the action or emphasizes that it was ongoing at the time.
“I saw the children playing in the park.”
“Can you smell something burning?”
Passive Perception
When the perception verb is used in the passive voice, the 'to' infinitive returns.
“He was seen to enter the building.”
“The suspect was heard to shout at the guard.”
Reference Table
| Form | Structure | Example |
|---|---|---|
|
Affirmative (Complete)
|
Subj + Verb + Obj + Base
|
I saw him cross the road.
|
|
Affirmative (In-progress)
|
Subj + Verb + Obj + -ing
|
I saw him crossing the road.
|
|
Negative
|
Subj + didn't + Verb + Obj + Base/-ing
|
I didn't hear her cry.
|
|
Question
|
Did + Subj + Verb + Obj + Base/-ing?
|
Did you feel the chair move?
|
|
Passive (Infinitive)
|
Obj + was seen + to + Base
|
He was seen to jump.
|
|
Passive (Participle)
|
Obj + was seen + -ing
|
He was seen jumping.
|
Formality Spectrum
He was observed to depart from the premises. (Workplace observation)
I saw him leave the office. (Workplace observation)
I caught him heading out. (Workplace observation)
I seen him bounce. (Workplace observation)
The Perception Choice
Bare Infinitive
- Whole Action Start to Finish
- Fact It happened.
Present Participle
- Part Action In the middle
- Atmosphere Ongoing
Bare vs. -ing
Which form should I use?
Is the sentence passive?
Did you see the whole thing?
Examples by Level
I see him run.
I hear her sing.
We watch the cat play.
Did you feel the rain fall?
I saw them eating lunch.
She heard someone calling her name.
We watched the sun going down.
I felt the wind blowing.
I watched him fix the car.
I watched him fixing the car.
Can you smell the bread baking?
I noticed her leave the room quietly.
I heard the floorboards creak in the middle of the night.
He was seen to enter the building through the back door.
I felt my skin crawling as he told the ghost story.
We observed the chemicals react in the test tube.
I perceived a slight tremor shake his hands.
The witness was heard to testify that the light was red.
I watched the ink slowly bleeding into the parchment.
She felt herself being pulled into the argument.
One could hear the distant thunder rumbling across the plains for hours.
The suspect, having been seen to discard the weapon, was immediately detained.
I watched the seasons shift from the window of my study.
He felt the weight of the world pressing down upon his shoulders.
Easily Confused
Learners confuse 'I smell the bread burning' (perception) with 'The bread smells burnt' (linking verb + adjective).
Learners don't know when to use 'I saw him leave' vs 'I saw that he left'.
Learners forget to add 'to' in passive sentences because they are so used to the active 'no-to' rule.
Common Mistakes
I saw him to go.
I saw him go.
I hear her sang.
I hear her sing.
I see him is running.
I see him running.
I watch the movie.
I watch him play.
I felt the house to shake.
I felt the house shake.
Did you see him left?
Did you see him leave?
I smelled the cake to burn.
I smelled the cake burning.
I saw him cross the street for ten minutes.
I saw him crossing the street for ten minutes.
He was seen enter the bank.
He was seen to enter the bank.
I noticed him to be angry.
I noticed that he was angry.
I observed the star to explode.
I observed the star explode.
She was heard singing the whole song.
She was heard to sing the whole song.
Sentence Patterns
I saw ___ ___ (base verb).
I heard ___ ___ (verb-ing).
___ was seen to ___ (base verb).
I felt ___ ___ (verb-ing) ___.
Real World Usage
I saw the suspect enter the building at 9 PM.
We see him driving toward the hoop, he shoots, he scores!
POV: You hear your mom calling your name from downstairs.
You'll see the sugar start to caramelize and turn brown.
Have you noticed your joints swelling in the morning?
I watched the team's productivity increase after we implemented the new system.
The 'Snapshot' Rule
Passive 'To'
Smell and Taste
Vivid Storytelling
Smart Tips
Use the bare infinitive to emphasize the suddenness and completion.
Use the passive 'was seen to' to sound more objective and professional.
Be careful! This rule only applies to physical perception. For emotions, use 'that' clauses.
Use the -ing form to show that the action happened over and over.
Pronunciation
Stress on the Action
In these sentences, the primary stress usually falls on the second verb (the action being perceived), not the perception verb itself.
Reduced 'him/her'
The object pronouns 'him' and 'her' are often reduced in natural speech, making the perception verb and the object sound like one word.
Falling Intonation for Facts
I saw him ↘cross.
Conveys a completed, factual observation.
Memorize It
Mnemonic
Perception verbs are 'to-free' zones in the active voice.
Visual Association
Imagine a camera. The bare infinitive is a 'Wide Shot' showing the whole scene. The -ing form is a 'Zoom' showing a close-up of the action happening.
Rhyme
If you see or hear or feel, skip the 'to' to keep it real.
Story
I watched a bird land on a branch (whole action). While I was watching, I saw it eating a worm (ongoing). Suddenly, I heard a cat meow (sudden/whole), and I felt the bird fly away (whole).
Word Web
Challenge
Look out your window for 2 minutes. Write 3 sentences using 'I see...' and 2 sentences using 'I hear...', alternating between the base form and the -ing form.
Cultural Notes
In some UK dialects, especially in the North, you might hear 'I seen him do it' instead of 'I saw him do it'. While common, this is considered non-standard in formal writing.
Southern American English often uses 'watch' or 'see' with a present participle to describe long, habitual actions in a storytelling context.
In legal contexts across the English-speaking world, the passive 'was seen to' is the standard way to report evidence without attributing it to a specific witness.
The bare infinitive after perception verbs is a remnant of Old English, where certain 'light' verbs did not require the 'to' marker (which was originally a preposition meaning 'towards').
Conversation Starters
Have you ever seen something truly strange happen in public?
What's the most beautiful thing you've ever watched someone do?
Describe a time you heard a mysterious noise at night.
If you were a witness to a crime, how would you describe what you saw to the police?
Journal Prompts
Common Mistakes
Test Yourself
I saw the bird ___ from the tree and fly away.
I could hear her ___ in the shower for over twenty minutes.
Find and fix the mistake:
He was seen leave the building late at night.
Active: They heard him shout. Passive: He ___.
I noticed him to be very quiet during the meeting.
A: Did you see the accident? B: Yes, I saw the car ___ the wall.
Select the correct form.
Match each item on the left with its pair on the right:
Score: /8
Practice Exercises
8 exercisesI saw the bird ___ from the tree and fly away.
I could hear her ___ in the shower for over twenty minutes.
Find and fix the mistake:
He was seen leave the building late at night.
Active: They heard him shout. Passive: He ___.
I noticed him to be very quiet during the meeting.
A: Did you see the accident? B: Yes, I saw the car ___ the wall.
Select the correct form.
1. I saw him cross. 2. I saw him crossing.
Score: /8
Practice Bank
12 exercisesWe often smell delicious food ___ (cook/cooking) from that new restaurant next door.
Did you ever feel the earth ___ (shake/shaking) during a minor tremor?
The audience watched the magician performed a trick flawlessly.
I distinctly heard my alarm to go off this morning.
Choose the correct sentence:
Which sentence best conveys a continuous observation?
Translate into English: 'Vi a la profesora explicando el tema difícil.'
Translate into English: 'Sentí el frío viento soplar.'
Arrange these words into a sentence:
Arrange these words into a sentence:
Match the verbs of perception with the correct complement type.
Match the sentences that highlight continuous observation.
Score: /12
FAQ (8)
Only in the passive voice (e.g., `He was seen to leave`). In active voice, it is always incorrect.
`I saw him run` means you saw the whole action from start to finish. `I saw him running` means you saw him while he was in the middle of the action.
Yes, but they almost always take the `-ing` form because smells and tastes are usually perceived as ongoing states.
No. Perception verbs don't work with perfect infinitives. Use a 'that' clause: `I saw that he had gone`.
This is a quirk of English history. When the verb becomes passive, it loses its 'light' status and requires the standard infinitive marker `to`.
Yes, `I watched him perform` is correct and implies you saw the whole performance.
No. The second verb must be the base form (`sing`) or the `-ing` form (`singing`).
Yes, they follow the same pattern: `I noticed him leave` or `I noticed him leaving`.
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
Ver/Oír + Infinitivo
Spanish doesn't have a direct equivalent to the -ing participle in this specific perception structure.
Voir/Entendre + Infinitif
French never uses the gerund (en partant) in this perception pattern.
Sehen/Hören + Infinitiv
German lacks a present participle (-ing) equivalent for this pattern, so the infinitive covers both completed and ongoing actions.
Verb + no/koto + o mita
Japanese requires a nominalizer, whereas English connects the verb directly to the object.
Ra'a / Sami'a + Present Tense
Arabic uses a conjugated verb rather than an infinitive or participle.
Kànjiàn / Tīngjiàn + Verb
Chinese has no morphological markers like -ing, so context determines if the action is complete or ongoing.
Learning Path
Prerequisites
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