I.1. Past simple

I.3. Articles

I.4. Will and be going to

1.1. Past tense contrast

1.2. Used to

2.1. Present perfect and past simple contrast

2.2. Present perfect simple and continuous

3.1. Speculating and predicting

3.2. The first conditional

3.3. Future continuous and future perfect

4.1. Comparison

4.2. The second conditional

4.3. I wish..., If only ...

4.4. Would rather, had better

5.1. Quantifiers

5.2. Must vs have to and modals in the past

5.3. Although, even though, in spite of, and despite

6.1. Cleft sentences

6.2. Gerunds, perfect gerunds and perfect participles

6.3. Indirect questions

7.1. The passive

7.2. Have something done

8.1. The third conditional

8.2. Participle clauses

8.3. Reply questions

8.4. Question tags