I)

1) She hasn't gone to a concert since 2012

2) I suggest eating out tonight

3) This room isn't used very clean

4) David asked her What she was looking at then

5) If we had a phone , we could call you

II)

1)Mary was happy to  go to the beach  last weekend although  it  was rainy.

2)The elephant is an animal which live in hot countries.

3)Jenny  likes  playing tennis in her free time.

4)I have been really pleased because he has just passed his exam.

5)This workbook was written  by a teacher  last year.

I 
1. she hasn't gone to a concert since 2021 
cấu trúc S+ LAST + V-QUÁ KHỨ (ED/CỘT 2 )+.......
 <-> S +HAVEN'T/HASN'T +V-PII + SINCE/FOR........
2.I suggest eating out tonight 
why don't we do sth ?<-> sb suggest doing sth
3. this room isn't used very often 

cấu trúc câu bị động hiện tại đơn

S + V(s/es) + O
<->O + am/is/are + P2
4. david asked her what she was looking at then .
cấu trúc câu gián tiếp thôi ạ 
5. if we had a phone , we would call you
cấu trúc câu điều kiện loại 2 nha 
II
1. mary was happy when going to the beach last weekend although it was rainy
2.the elephant is an animal and living in hot countries ( câu này mk dùng cách viết của mệnh đề quan hệ rút gọn nhé)
3. jenny likes playing tennis in her free time
4.i'm really pleased that he just passed his exam 
5. this workbook was writen by a teacher last year