Grammar Topics
Browse and filter all grammar topics by level or category.
134 topics found
Present Perfect Continuous
The Present Perfect Continuous focuses on the duration and ongoing nature of an activity up to now. Contrasts with Present Perfect Simple.
Must / Can't for Logical Deduction
Use must and can't to express logical deduction — must for near-certain positive conclusions and can't for near-certain negative ones. Includes past deductions with must have and can't have.
Past Perfect
The Past Perfect (had + past participle) describes an action completed before another past action. Essential for narrative sequencing.
Should Have / Could Have / Would Have
Should have, could have, and would have express regret, missed opportunities, and hypothetical past results. Essential for third conditionals and reflecting on past decisions.
Past Perfect Continuous
The Past Perfect Continuous (had been + -ing) emphasises the duration of an activity that was ongoing before a past event.
Needn't / Needn't Have
Needn't expresses absence of obligation (it's not necessary). Needn't have + past participle shows an action was done unnecessarily. Learn the key contrast with mustn't and didn't need to.
Causative Verbs
Causative verbs (have, get, make, let, help) describe situations where one person causes another to do something. Each verb has a distinct structure and meaning.
Derivation (Prefixes, Suffixes, Root Words)
How derivational morphology builds new words: Greek/Latin roots, and layered affixation.
Punctuation as Grammar
How punctuation marks affect meaning and structure: semicolons, colons, dashes, and comma splices.
Conversion (Zero Derivation)
Words that change class without any suffix: to email → an email, to google, to water (plants).
Advanced Discourse Markers
Sophisticated linking language for formal writing: albeit, notwithstanding, in light of, to this end, by contrast.
Third Conditional
If + past perfect, would have + past participle — for hypothetical past situations and regrets.