English Grammar Hub

Understand English Grammar Faster

Browse the grammar system by level and category, then open clear explanations with practical examples.

780 Total Rules
126 Chapters
7 CEFR level
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Active filters: CEFR level: B1
B1 Prepositions

How to Use 'Set up' (Phrasal Verb)

Master 'set up' to confidently discuss arrangements, establishments, and preparations in English.

  • • Versatile verb: organize, establish, prepare, or e...
  • • Usually separable; must separate with pronouns (se...
12 examples 8 exercises 8 FAQ
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B1 Prepositions

How to use 'Call Off' (Cancel Events)

Master `call off` to naturally express event cancellations and sound like a fluent English speaker!

  • • Cancel scheduled events, meetings, or plans.
  • • Separable phrasal verb: `call it off`.
12 examples 8 exercises 8 FAQ
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B1 Prepositions

How to use 'Catch Up' (Phrasal Verb)

Close the gap, get informed, or reconnect — `catch up` is your go-to phrasal verb.

  • • Reach same level, speed, or knowledge.
  • • Often with 'on' for info, 'with' for people.
12 examples 8 exercises 8 FAQ
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B1 Confusable-words

However vs. How-ever: What's the Difference?

`However` provides contrast, while `how ever` questions with surprise.

  • • `However` connects contrasting ideas; `how ever` e...
  • • Use a period or semicolon before `however` and a c...
11 examples 8 exercises 8 FAQ
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B1 Gerunds & Infinitives

I Can't Help It! (Can't Help + Gerund)

Use 'can't help + gerund' to express an involuntary, irresistible urge or emotional reaction.

  • • Expresses an uncontrollable action or feeling.
  • • Formed by 'can't help' followed by a gerund.
11 examples 8 exercises 8 FAQ
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B1 Confusable-words

I-have vs. I-has vs. I-had: What's the Difference?

Use `has` for a single person/thing in the present (he, she, it); use `have`/`had` for everything else.

  • • `Have` is for I, you, we, they; `Has` is for he, s...
  • • `Had` is the past tense for everyone and everythin...
11 examples 8 exercises 8 FAQ
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B1 Confusable-words

I-love-you-to vs. Too: What's the Difference?

`To` is for direction or verbs; `too` is for adding on or having too much.

  • • `To` is for direction, purpose, or connection (go...
  • • `Too` means 'also' or 'excessively' (me too, it's...
10 examples 8 exercises 8 FAQ
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B1 Verb Moods

If I Were vs. If I Was (Second Conditional)

Master 'if I were' for flawless expression of unreal or hypothetical situations.

  • • Use 'were' for all subjects in hypothetical 'if' c...
  • • Formation: If + Subject + were, Subject + would +...
12 examples 8 exercises 8 FAQ
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B1 Confusable-words

If vs. Else-if vs. Elsif: What's the Difference?

`if` and `else if` are standard conditional logic; `elsif` is just a language-specific shorthand for `else if`.

  • • `if` starts a condition, `else if` adds another ch...
  • • `if (condition)` is universal; `else if` is common...
12 examples 8 exercises 8 FAQ
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B1 Confusable-words

In vs. Within: What's the Difference?

`In` is for a general place or time; `within` is for a contained place or a limited time.

  • • `In` is for general location or a point in time.
  • • `Within` emphasizes a boundary, limit, or a period...
10 examples 8 exercises 8 FAQ
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B1 Grammar

Indirect Questions: Could You Tell Me Where...?

Indirect questions are politer and more formal than direct questions. After the introductory phrase, use statement word order (not question word order) — no inversion, no do/does/did.

  • • Start with: Could you tell me... / Do you know......
  • • Word order: same as a statement — Could you tell m...
5 examples 8 exercises 8 FAQ
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B1 Confusable-words

It-has vs. It-have: What's the Difference?

'It' is a singular subject, so it always gets the singular verb: `has`.

  • • 'It' is singular, so it uses the singular verb `ha...
  • • The pattern is `he has`, `she has`, and `it has`.
10 examples 8 exercises 8 FAQ
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B1 Confusable-words

Less vs. Fewer: What's the Difference?

If you can count the noun, use fewer. If you can't, or it's a block of time or money, use less.

  • • Use fewer for items you can count, and less for am...
  • • The pattern is fewer + [plural noun] and less + [u...
12 examples 8 exercises 8 FAQ
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B1 Confusable-words

Less vs. Lesser: What's the Difference?

Less is about 'how much' (quantity), while lesser is about 'not as important' (quality).

  • • Use less for a smaller quantity of uncountable thi...
  • • Use lesser as an adjective to mean 'of lower quali...
11 examples 8 exercises 8 FAQ
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B1 Confusable-words

Let-he vs. I-know: What's the Difference?

After let, use an object pronoun (me, him) not a subject pronoun (I, he).

  • • After the verb let, always use an object pronoun l...
  • • The correct pattern is `let + object pronoun + bas...
12 examples 8 exercises 8 FAQ
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B1 Confusable-words

Let-he vs. Let-him: What's the Difference?

After the verb let, always use an object pronoun (him, her, me), never a subject pronoun (he, she, I).

  • • The verb let must be followed by an object pronoun...
  • • The correct pattern is always `Let + Object Pronou...
12 examples 8 exercises 8 FAQ
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B1 Confusable-words

Let-she vs. Let-her: What's the Difference?

After let, always use an object pronoun like her, me, or them—never a subject pronoun like she, I, or they.

  • • The verb let is always followed by an object prono...
  • • The correct pattern is Let + `Object Pronoun` + `B...
12 examples 8 exercises 8 FAQ
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B1 Confusable-words

Let-them vs. Let-they: What's the Difference?

After the verb 'let', always use an object pronoun like 'me', 'her', or 'them'.

  • • Always use the object pronoun them after the verb...
  • • The correct pattern is let + them + `base verb` (e...
11 examples 8 exercises 8 FAQ
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B1 Verb Moods

Logical Guessing with 'Must' (Epistemic)

Use 'must' to confidently state logical conclusions when evidence strongly suggests something is true.

  • • Must: strong logical guess based on clear evidence...
  • • Formed with 'must + base verb' or 'must have + pas...
12 examples 8 exercises 8 FAQ
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B1 Verb Moods

Logical Impossibility (It can't be!)

`Can't be` (present) and `couldn't have been` (past) express strong logical impossibility based on evidence.

  • • Use `can't be` for present logical impossibility.
  • • Form with `can't + base verb` or `couldn't have +...
10 examples 8 exercises 8 FAQ
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Why Learn English Grammar?

Grammar is the foundation of language fluency. Without understanding grammar patterns, you can memorize vocabulary but struggle to form correct sentences. Here's why structured grammar study matters:

Build Accurate Sentences

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Knowing grammar helps you parse complex sentences, understand nuance, and follow conversations even when speakers use advanced constructions.

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How Our English Grammar Course Works

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Start with your CEFR level — from A0 Zero Point to C2 Mastery. Not sure? Begin at A0 and progress at your own pace.

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Study Structured Chapters

Each chapter covers a grammar topic with clear explanations, pattern tables, and real-world example sentences.

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Test your understanding with interactive exercises — fill-in-the-blank, multiple choice, sentence building, and translation practice.

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Frequently Asked Questions About English Grammar

SubLearn covers 780 English grammar rules organized across 7 CEFR proficiency levels (from A0 to C2), spanning 126 structured chapters. Each rule includes clear explanations, real-world examples, and interactive practice exercises.

Our English grammar curriculum covers CEFR levels from A0 to C2. Each level is designed to match your current proficiency — beginners start with basic sentence patterns at A1, while advanced learners tackle nuanced structures at C1-C2.

Yes! All English grammar rules, explanations, and examples are completely free to access. You can browse the full curriculum, read detailed explanations, and practice with exercises at no cost.

Grammar is organized into 126 thematic chapters following the CEFR framework. Each chapter groups related rules together — for example, verb tenses, sentence structure, or particles — so you can learn related concepts in a logical sequence.

Yes! Create a free account to track which grammar rules you've studied, see your progress across all CEFR levels, and pick up exactly where you left off. Your learning progress syncs across devices.

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