Unit 1 - TENSES

Present continuous

I am doing

Unit 2 - TENSES

Present simple

I do

Unit 3 - TENSES

Present continuous and present simple 1

I am doing and I do

Unit 4 - TENSES

Present continuous and present simple 2

I am doing and I do

Unit 5 - TENSES

Past simple

I did

Unit 6 - TENSES

Past continuous

I was doing

Unit 17 - VERBS

Have and have got

Unit 18 - VERBS

Used to (do)

Unit 71 - NOUNS

Countable nouns with a/an and some

Unit 72 - NOUNS

A/an and the

Unit 85 - NOUNS

Some and any