Luyện ngữ pháp - English Grammar in Use - Intermediate
Unit 6: Past continuous

STT	Tên task	Số câu hỏi
1	Grammar Explanations and Rules	1
2	Exercises - 6.1	6
3	Exercises - 6.2	5
4	Exercises - 6.3	13
5	Exercises - 6.4	19

Unit 5: Past simple

Unit 7: Present perfect 1