1 Present simple (I do) and present continuous (I am doing) (1)
2 Present simple (I do) and present continuous (I am doing) (2)
3 Present perfect (I have done) and past simple (I did) (1)
4 Present perfect (I have done) and past simple (I did) (2)
5 Present perfect (I have done) and past simple (I did) (3)： adverbs used with these tenses
6 Past continuous (I was doing) and past simple (I did)
7 Present perfect continuous (I have been doing)
8 Present perfect continuous (I have been doing) and present perfect (I have done)
9 Past perfect (I had done) and past simple (I did)
10 Past perfect continuous (I had been doing) and past perfect (I had done)
The future
11 Will and going to; shall
12 Present continuous (I am doing) for the future and going to
13 Present simple (I do) for the future
14 Future continuous (will be doing)
15 Be to + infinitive (I am to do)， future perfect (I will have done)，
and future perfect continuous (I will have been doing)
16 The future seen from the past (was going to， etc.)
Modals
Be，have ，do，make，etc.
passives
Questions
verbs：infinitives，-ing forms，etc.
Reporting
Nouns and compounds
Articles
Determiners and quantifiers
Relative clauses and other types of clause
Pronouns，substitution and leaving out words
Adjectives
Adverbs and conjunctions
Prepositions
Organising information
……
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