ai biết giúp em với ạ <3

1. I haven't seen Nam for 3 years.

-> It's + khoảng thời gian + since + S2 + last + V2/ed = S + have/has + Vpp + for 

2. Carol told Peter not to make so much noise.

-> tell + SO + to V/ not to V: yêu cầu ai đó làm gì/ không làm gì 

3. It's very important to keep the environment clean.

-> It's be + adj + to V

4. Mrs Hoa suggested that Nam should turn off all the lights before going out.

-> suggest + that + S + should + Vinf

5. How about planting some trees around your house to get fresh air ?

-> how about + Ving