We should use public transportation to reduce air pollution(so)

We should.....

This celebration often lasts 𝙩𝙝𝙚 𝙚𝙣𝙩𝙞𝙧𝙚 𝙬𝙚𝙚𝙠(make a questions for the underline part)

If the food crops are affected by water pollution,there will be a lack of food

There will not be....

Giúp em vs ạ,em cảm ơn!!!!

`1`.We should use public transportation so as to reduce air pollution 

`->` Clause + so as / in order + ( not ) to do sth

`=>` Dùng để chỉ vè mục đích

`2`.How long does this celebration often last ?

`->` Thì HTĐ ( NV ) : Do / Does + S + V ?

`=>` Does `+` He , She , It

`->` How long dùng để hỏi về bao lâu

`3`.There will not be a lack of food if the food crops aren't affected by water pollution

`->` CĐK Loại `1` : Dùng để diễn tả hành động có thật ở Hiện tại

`-` If - clause : Thì HTĐ : S + Vs / es

`-` Main - clause : Thì TLĐ : S + will + V 

`\text{# TF}`

`1.` We should use public transportation so as to reduce air pollution.

`->` S + V + so as to + V : Ai làm gì để làm gì

`2.` How long does this celebration often last?

`->` The entire week : Cả tuần 

`=>` How long : Bao lâu | HTĐ : Do/does + S + V

`33` There will not be a lack of food if water pollution doesn't affect the food crops.

`->` ĐK`1` : If + S + V(s/es) + O, S + will + V (If HTĐ, TLĐ)