Complete the sentences with the correct conditional form of the verbs in brackets.

1. If you want (want) to have a greener house, grow (grow) some grass on your balcony or roof.

S + V + are/is/am +.......

2. Do not use (not/use) air conditioning unless you really have (have) to.

Do not use : không được dùng

3. If you feel (feel) strongly about saving our planet, scting (act) now!

If + you + v / v-ing + about +.

4. Unless we plant (plant) new trees now, there  are (not be) any forests left.

Unless we plant : trừ khi chúng ta trồng 

5.If the weather is (is) nice, leave (leave) the car at home and walk.

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