It is a very (useful,有用的) book for language learners to improve writing skills.
改为同义句.
1、Where is your pen pal from?
Where does your pen pal come from?
2、He didn't want to do anything.
He wanted to do nothing.
3、It's time for dinner.
It's time to have dinner.
4、出门的时候我忘记带钥匙了.
I (fortot to) take the key when i went out.
5、萨姆开始好好学习了.
Sam （began to study） hard.