1We have several chairs and tables in the kitchen

2Only a few people understand their lectures

3We don't have to throw garbage

4We must be in the classroom discussion on Saturday

5The tour guide says that we do not dispose of indiscriminate garbage

`\text{1.}` We have some chairs and a table in the kitchen.

`->` S + have/has + O... .

`\text{2.}` Only some people can understand his lecture. 

`->` Dịch : Chỉ một số người có thể hiểu bài giảng của ông.

`\text{3.}` We mustn't throw rubbish .

`\text{4.}` We must be present at the class discussion on Saturday .

`->` must/mustn't + V_inf = những cụm từ it is necessary (for+sbd) to do sth . 

`\text{5.}` The tour guide says that we shouldn't throw rubbish .

`->` Cấu trúc câu khuyên bảo : Should + V_inf