English Grammar Reference: 48 Key Structures
Grammar is best acquired through exposure to comprehensible input, not memorising rules — but this reference helps when you encounter a structure and want to understand it. Browse all 48 entries or filter by category.
48 structures · 6 categories
"Simple Present"
Expresses habits, facts, and states that are generally true.
"She drinks coffee every morning."
"Present Continuous"
Describes an action happening right now or a temporary situation.
"He is reading a report at the moment."
"Present Perfect"
Links a past action to the present; the exact time is unimportant.
"I have visited Tokyo three times."
"Present Perfect Continuous"
Shows an action that started in the past and is still happening or just stopped.
"They have been working on the project since Monday."
"Simple Past"
Describes a completed action at a specific time in the past.
"We launched the app last year."
"Past Continuous"
Describes an ongoing action at a specific moment in the past, often interrupted.
"I was cooking when she called."
"Past Perfect"
Describes an action completed before another past action.
"By the time he arrived, we had already left."
"Future with "will""
Expresses spontaneous decisions, predictions, and promises about the future.
"I think it will rain tomorrow."
"Zero Conditional"
States general truths and scientific facts. Uses present tense in both clauses.
"If you heat water to 100 °C, it boils."
"First Conditional"
Describes a real and possible future situation and its likely result.
"If it rains, we will cancel the picnic."
"Second Conditional"
Describes an unlikely or imaginary present/future situation.
"If I had more time, I would learn Japanese."
"Third Conditional"
Describes a hypothetical change to a past situation and its imagined result.
"If she had studied harder, she would have passed."
"Mixed Conditional"
Combines a past condition with a present result, or vice versa.
"If I had taken that job, I would be living in Berlin now."
"Unless"
"Unless" means "if not" and introduces the negative condition elegantly.
"Unless you leave now, you will miss the train."
"Wish + Past Simple"
Expresses a desire for a present situation to be different.
"I wish I spoke better French."
"Wish + Past Perfect"
Expresses regret about something that happened or did not happen in the past.
"I wish I had listened to her advice."
"Present Simple Passive"
Describes what is regularly done to the subject. Formed with am/is/are + past participle.
"The reports are reviewed every Friday."
"Past Simple Passive"
Describes what was done to the subject at a specific time.
"The bridge was built in 1923."
"Present Perfect Passive"
Focuses on the result of a past action with current relevance.
"Three new vaccines have been approved this year."
"Future Passive"
Describes what will be done to the subject in the future.
"The results will be announced on Friday."
"Modal Passive"
Combines modal verbs with the passive for obligation, possibility, or advice.
"This form must be signed by a manager."
"Passive with "by""
Identifies the agent when it adds important information.
"The theory was proposed by Einstein."
"Passive with "get""
An informal alternative to be-passive, often implying an unexpected event.
"She got promoted after only six months."
"Causative "have/get""
Describes arranging for someone else to do something for you.
"I had my car serviced at the garage."
"Defining Relative Clause"
Identifies which specific noun is meant. No commas are used. Cannot be removed.
"The man who called you is my brother."
"Non-defining Relative Clause"
Adds extra information about a noun already identified. Set off by commas.
"My sister, who lives in Paris, is a chef."
"Relative Pronoun "who""
Refers to people as the subject or object of the relative clause.
"The teacher who inspired me the most retired last year."
"Relative Pronoun "which""
Refers to things or animals, and can refer back to an entire clause.
"The project, which took two years, was a great success."
"Relative Pronoun "that""
Refers to people or things in defining clauses (not used in non-defining ones).
"This is the book that changed my life."
"Relative Pronoun "whose""
Shows possession, referring to people, animals, or things.
"The student whose essay won the prize is from Brazil."
"Relative Pronoun "where""
Refers to a place within a relative clause.
"The town where I grew up is very small."
"Omitting the Relative Pronoun"
The relative pronoun can be dropped when it is the object of the relative clause.
"The film (that) we watched last night was excellent."
"Can / Can't"
Expresses ability (present) or possibility. "Can't" expresses impossibility or prohibition.
"She can speak four languages."
"Could"
Expresses past ability, polite requests, or weak possibility.
"Could you pass me the salt, please?"
"Must"
Expresses strong obligation (from the speaker) or logical certainty.
"You must wear a seatbelt at all times."
"Have to"
Expresses external obligation or necessity (rules, laws, circumstances).
"I have to submit the form by Friday."
"Should / Ought to"
Expresses advice, recommendation, or a weak obligation.
"You should see a doctor about that cough."
"May / Might"
"May" expresses permission or possibility. "Might" suggests weaker possibility.
"It might rain this afternoon — take an umbrella."
"Would"
Expresses willingness, habitual past actions, or polite offers and requests.
"Would you like another coffee?"
"Need not / Don't have to"
Expresses the absence of obligation — something is not required.
"You don't have to wear a tie to the meeting."
"Indefinite article "a/an""
Introduces a singular countable noun for the first time or classifies it as one of many.
"She bought a new laptop."
"Definite article "the""
Refers to a specific noun already known to both speaker and listener.
"Please close the window — it's cold."
"Zero article with plurals"
No article is used with plural nouns making general statements.
"Cats are independent animals."
"Zero article with uncountable nouns"
No article is used with uncountable nouns in general statements.
"I love music."
""The" with superlatives"
The definite article is always used before superlative adjectives.
"That was the best meal I have ever had."
""The" with unique nouns"
"The" is used with nouns that are one of a kind or considered unique.
"The sun rises in the east."
""A/an" vs "the" on second mention"
Use "a/an" the first time you mention something; switch to "the" on second mention.
"I saw a dog in the park. The dog was chasing a ball."
"No article with proper nouns"
Most names of people, cities, and countries take no article.
"She moved to Tokyo last spring."
Frequently Asked Questions
Do I need to memorise grammar rules to speak English fluently?
No. Research in second language acquisition consistently shows that fluency comes from massive exposure to comprehensible input — listening and reading in English — rather than memorising rules. Grammar rules are useful as a reference when you want to understand a structure you have noticed, but they do not drive fluency on their own.
How many tenses does English really have?
Linguists debate this, but English is commonly described as having 12 tenses when you combine simple, continuous, perfect, and perfect-continuous forms across past, present, and future. In practice, the present simple, present continuous, past simple, and present perfect cover the vast majority of everyday usage.
What is the difference between "must" and "have to"?
"Must" expresses an internal obligation — the speaker imposes the rule (e.g. "I must exercise more"). "Have to" expresses an external obligation imposed by circumstances, rules, or other people (e.g. "I have to show my passport at the border"). In questions and negatives, "have to" is more natural in everyday English.
When should I use "who" vs "that" in relative clauses?
Both "who" and "that" can refer to people in defining (restrictive) relative clauses. "Who" is generally preferred in formal writing when referring to people. "That" is not used in non-defining (non-restrictive) clauses — you must use "who" or "which" there. For things, use "which" in non-defining clauses and either "that" or "which" in defining ones.
Why is the English article system so difficult for speakers of other languages?
Many languages — including Russian, Japanese, Chinese, and several others — do not have articles at all, making the system feel arbitrary. The good news is that native speakers acquire article use through massive exposure, not by memorising rules. Learners who listen and read extensively in English absorb article patterns naturally over time.
Grammar patterns stick when you encounter them in real speech and writing.
Practice with real English videos →