Meaning
To write information into blank spaces on a form.
Cultural Background
Americans often use 'fill out' for entire forms and 'fill in' for specific blanks. British English speakers prefer 'fill in' for almost all paperwork. In modern offices, 'fill in' is often replaced by 'update' or 'populate' in digital systems. Teachers use 'fill in' to test basic comprehension in exams.
Pronoun Placement
Always put 'it' or 'them' between 'fill' and 'in'.
Don't use for liquids
Use 'fill up' for gas or water.
Meaning
To write information into blank spaces on a form.
Pronoun Placement
Always put 'it' or 'them' between 'fill' and 'in'.
Don't use for liquids
Use 'fill up' for gas or water.
British vs American
Use 'fill in' for everything in the UK; use 'fill out' for forms in the US.
Test Yourself
Fill in the blank with the correct phrase.
Please ____ the application form before you leave.
Both 'fill in' and 'fill out' are acceptable, but 'fill in' is the target.
Choose the correct sentence.
Which sentence is grammatically correct?
Pronouns must go between the verb and the particle.
Match the phrase with its meaning.
Match 'fill in' with the correct context.
'Fill in' is for forms; 'fill up' is for gas tanks.
Complete the dialogue.
A: I missed the meeting. B: Don't worry, I'll ____.
'Fill you in' means to update someone.
🎉 Score: /4
Visual Learning Aids
Practice Bank
4 exercisesPlease ____ the application form before you leave.
Both 'fill in' and 'fill out' are acceptable, but 'fill in' is the target.
Which sentence is grammatically correct?
Pronouns must go between the verb and the particle.
Match each item on the left with its pair on the right:
'Fill in' is for forms; 'fill up' is for gas tanks.
A: I missed the meeting. B: Don't worry, I'll ____.
'Fill you in' means to update someone.
🎉 Score: /4
Frequently Asked Questions
10 questionsIt is neutral. It works in most situations.
Yes, that is perfectly correct.
They are mostly the same, but 'fill out' is more common for whole forms in the US.
No, use 'fill up' for bottles.
It means to give someone an update.
Yes, it is a separable phrasal verb.
Yes, it is professional enough.
Because you are filling the empty spaces with information.
It is 'fill in' as a verb and 'fill-in' as a noun (e.g., a substitute).
Yes, it is very common for online forms.
Related Phrases
Fill out
synonymTo complete a form.
Fill up
contrastTo make a container full.
Fill in for
specialized formTo substitute for someone.
Fill someone in
specialized formTo update someone.
