1.arrive late for class =be late for class 上课迟到
a lot of+不可数名词/可数名词复数 “许多的,大量的 ”
4.don't(doesn’t) have to do sth不必做某事
5.be on time for class准时上课
6.help sb. (to) do sth. 帮助某人做某事
7.practice doing sth. 练习做某事
8.be strict with+人 “对某人要求严格”
9.be strict in sth. 对某事要要求严格
11.leave +物品+in the kitchen 把某东西忘在厨房里
15.get sth. for sb. 替某人取某物
17.want sb. to do… 想要某人做……
18.It's best to do… 做……是最好的
19.keep + 宾语+形容词 使……保持某种状态
20.keep one’s hair short 某人留短发