2. be good at sth.=do well in sth. 擅长某
be good at doing sth.=do well in doing sth. 擅长做某事
7. It’s +adj. + to do sth 做某事是 ….
8. speak slowly and loudly to sb
对某人讲得又慢又大声
9. need to do sth 需要做某事
want to do sth = would like to do sth
想要做某事
10. No one 谓语动词用单数
11. It’s + 形容词 +for sb to do sth做某事对某人来说是 ……
12. work hard 努力学习 / 工作
13. do some sightseeing =go sightseeing
14. take sb. around 带某人参观
15. Don’t be late