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All 12 English tenses, with contrasts like present perfect vs past simple.

Zero to mixed conditionals, wishes and transformations.

Ability, obligation, probability and modal perfects.

Backshift, reporting verbs, say vs tell.

Be + past participle, the causative and reporting structures.

a, an, the and the zero article — specific or general?

at, on, in for time and place, movement and fixed pairs.

Countable/uncountable, some/any, much/many, this/that.