B1 语法

Complex word order

Present perfect

Passive voice basics

First and second conditionals

Relative clauses

Gerunds and infinitives

Reported speech

Verbs followed by -ing or the infinitive

used to, be used to, get used to

Question tags

Zero and first conditional

Modals of deduction: must, might, can't

First and second conditional

Modals of past deduction

Third conditional

too and enough

Indirect and reported questions

Present perfect continuous

Past perfect