Viết lại các câu sau sao cho nghĩa không đổi: His father is 1.70 m tall. His mother is 1.60 m tall. To do morning exercises regularly is good for your health

Viết lại các câu sau sao cho nghĩa không đổi:
1. His father is 1.70 m tall. His mother is 1.60 m tall.
--> His mother is.....................................................
2. To do morning exercises regularly is good for your health.
--> It's.......................................................
3. Remember to turn the lights off before you go to bed.
--> don't..........................................................
4. She's our good friend .
--> she's...................................