1. You'd better not to eat too much sugar

2. Did Tom receive a lot of presents on his birthday ?

3. I've never eaten this delicous cake before

4.  No one in the class plays guitar better than you.

5.  We spent 3 months preparing for the festival.

1. I advice you not to eat too much sugar. 
⇒ You'd better not to eat too much sugar

2. Was Tom given a lot of presents on his birthday ?
⇒ Did Tom receive a lot of presents on his birthday ?

3. This is the first time I have eaten this delicious cake. 
⇒ I've never eaten this delicous cake before

4.  You are the best guitarist in the class.
⇒ No one in the class plays guitar better than you.

5.  It took us 3 months to prepare for the festival.
⇒ We spent 3 months preparing for the festival.

Xin 5 sao + CTLHN nha