Giúp em bài do as directed với ạ

1.  Henry's villa is more expensive than Martin's villa.

S + be + more + ADJ dài + than + .... 

expensive (3 âm tiết) --> ADJ dài

2. His house is farther from school than my house 

far + from 

far là từ đặc biệt

--> ss hơn farther than / further than

3. Other students in my class aren't as tall as William. 

S + be + not + as + adj + as + N/PN : không bằng

4. You mustn't drop litter at public places or natural landscapes.

Mustn't + V1: không được

#STMIN