Đáp án+Giải thích các bước giải
1.This ruler is shorter than that one.
=> That ruler is longer than this one.(Cái thước kia thì dài hơn cái thước này.)
2.My family has five people.
=> There are five people in my family.(There are+số đếm+Nsonhieu+...)
3.How old is she?
=> What is her age?(What+to be+S+age?)
4.Let's go camping!
=> Why don't we go camping?(Why don't we+Vinf+...)
5.There are twenty teachers in my school.
=> My school has twenty teachers.(Trường của tôi có 20 giáo viên.)
 Cho xin ctlhn ạ! (Chúc học tốt).

`1. That ruler is longer than this one.

S + be + short-adj + er+ than + O : ss hơn 

2. There are five people in my family.

There are + số lượng + N số nhiều 

3. What is her age?

How old + be + S?

= What + be + one's age?

--> hỏi tuổi 

4. Why don't we go camping?

Let's + V1

= Why don't we / you + V1? đưa ra ý kiến, đề nghị 

5. My school has twenty teachers.

S số ít + has + N 

`color{orange}{~LeAiFuRuiHuiBao~}`