A, An, The

Unit 1: Present continuous (i am doing)

Unit 2: Present simple (I do)

Unit 3: Present continuous and present simple 1 (I am doing and I do)

Unit 4: Present continuous and present simple 2

Unit 5: Past simple (I did)

Unit 6: Past continuous (I was doing)

Unit 7

Unit 8

Unit 9

Unit 10

Unit 11

Unit 12

Unit 13

Unit 14