`1.` you need to bring bottled water

`=>` S + need to + Vinf + O: Cần một thứ gì đó

`2.` I bring a book so as to read it at night

`=>` S + V + so as to/in order to + ......

`3.` Let's recycle plastics bags and jars

`=>` Sau let là động từ nguyên mẫu

`=.` Let  + Vinf + O

`4.` They are going to go on a pinic in the mountain nextweek

`=>` Thì tương lai gần

`=>` S + be going to + V + O

1 . You should bring bottled water 

- It's necessary ( for sb ) + to V = S + should + V nguyên mẫu 

2 . I bring a book so as to read at night 

- So as to + V nguyên mẫu : Để mà ... ( làm việc gì ) 

3 . Let's recycle plastic bags and jars 

- Let's + V nguyên mẫu 

4 . They are going to go on a picnic in the mountain next week 

- S + plan + to V = S + is / am / are + going to + V nguyên mẫu