A.

26. We are going to spend a month in the forest.

- Thì TLG: (+) S + is/am/are + going to + V(bare)

- in (trong): dùng trong 1 khu vực, khoảng không

- in the forest: trong rừng

27. Why did he go to school so early yesterday?

- DHNB: yesterday 

-> Thì QKĐ: (?) Wh-word + did + S + V(bare)?

- Why: dùng để hỏi về nguyên nhân/ lí do

28. I think it is a great idea to build a birdhouse in our garden.

- S + think(s) + Clause (S + V + O): nghĩ

- It is a great idea + to V

- a/an + N số ít

- in (trong): dùng trong 1 khu vực, khoảng không

B.

29. We want to go mountain climbing this weekend. However, my parents don't argee.

- Clause 1 (S + V + O). However, Clause 2 (S + V +O): tuy nhiên

- want to + V(bare): muốn làm gì đó

- Thì HTĐ: (-) S + don't/doesn't + V(bare)

30. People in the town throw rubbish everywhere, so tourists don't want to visit this place.

- Clause 1 (S + V + O), so + Clause 2 (S + V +O): tuy nhiên

- Thì HTĐ:

(+) S + V(s/es)

(-) S + don't/doesn't + V(bare)