15. We( be ) ......................tired and we ‘d like (sit) ...............down. 16. My parents ( visit ) …....…Ha Long Bay this summer vacation. 17. Nam usually ( study ) ………....in the school library in the afternoon , but he sometimes ( play )……soccer with his friends. 18. Mr Minh ( not / live ) ......in town. His house is in thecountry. 19. My father ( watch ) ……….television in the living-room . He often ( watch )…… T.V. in the afternoon . 20. Lan and Phuong (be ) …….….in the kitchen . They ( cook ) ………….dinner now . 21. We (eat).................... a delicious dinner at a Mexican restaurant last Wednesday. 22. Yesterday, I (phone)...................my friend in American. 23. Where..............you (go)................last week? I (stay).................at home and (listen)...................to some English songs on radio. 24. What are you doing now? I (do).........................my Math exercises. 25. My father often (watch)...................the morning news while he is having breakfast. 26. She (not visit).........................her grandmother last week. 27. They (not go)..........................to school yesterday. 28. We (have)........................Geography tomorrow. 29. He (not come)............................to see me next weekend. 30. They (not read)......................books now, they (talk).....................about the film.

Công thức thì HTĐ (V: tobe)

(+) S + am/is/are ..

(-) S + am/is/are + not .. 

(?) Am/Is/Are + S + ... ? 

I + am

S số ít, he, she, it + is

S số nhiều, you ,we, they + are

Công thức thì HTĐ (V: thường)

S số ít, he, she, it 

(+) S + Vs/es

(-) S+ doesn't + V1 

(?) Does +S +V1?

S số nhiều, I, you, we, they

(+) S + V1 

(-) S+ don't + V1 

(?) Do + S+ V1? 

DHNB: always, usually, sometimes, often, never, seldom,....

Công thức thì TLĐ

(+) S + will + V1 

(-) S + won't + V1 

(?) Will + S+ V1? 

DHNB: in the future, in + năm ở TL, in + time, next week, next year, ....

Công thức thì HTTD 

(+) S + am/is/are + Ving 

(-) S + am/is/are + not + Ving 

(?) Am/Is/Are +S +Ving? 

DHNB: now, right now, (!), at present, at the moment,.....

Công thức thì QKĐ (V: thường)

(+) S + V2/ed 

(-) S + didn't + V1 

(?) Did + S+ V1?

DHNB: ago, last (year, month ...), yesterday, in + năm QK, ...

---------------------------------------------

15. are / to sit 

would like + to V / N : muốn 

16. are going to visit 

DHNB: this summer vacation (TLG)

S + am/is/are + going to +V1 

17. studies / plays

DHNB: usually, sometimes (HTD) 

18. doesn't live 

19. is watching / watches 

DHNB: often (HTD)

20. are / are cooking

DHNB: now (HTTD) 

21. ate

DHNB: last Wednesday (QKD) 

22. phoned 

DHNB: yesterday (QKD) 

23. did / go / stayed / listened 

DHNB: last week (QKD) 

24. am doing 

DHNB: now (HTTD) 

25. is watching 

HTTD + while + HTTD: hành động song song / cùng lúc 

26. didn't visit 

DHNB: last week (QKD) 

27. didn't go 

DHNB: yesterday (QKD)

28. will have

DHNB: tomorrow (TLD)

29. isn't coming 

DHNB: next weekend (HTTD) 

30. aren't reading / are talking 

DHNB: now (HTTD)