1. any后加单数还是复数

• 做“一些”时接复数。
• 做“任何一个”时接单数。

2. help sb to do/help sb do

• help sb to do - 帮某人一起做
• help sb do - 帮某人做

3. spend time doing sth/spend sth on sth

• I spent an hour in watching TV. 我看了一个小时的电视。
• I spent ten yuan on the book. 我花了十元买这本书。

4. 第三人称 + 情态动词(may, can, could, should, might, must, need, have to……) + 动词原形

5. another, other, the other, others区别

• another泛指（指三者或三者以上中的）另一个 ， I don’t like this one. Please give me another.

• other意思是“另外的，其他的”
  What other animals do you like?

• others泛指“另外的人或物”，它自己就做名词，后面不用加名词。例如：Some people like swimming, and others like boating.

• the other通常指两个中的“另一个”。例如：She has two daughters. One is a teacher, the other is a doctor.

• the others 指某范围内的“其余全部的人或物”。例如：There are forty books in the box. Ten are mine, and the others are my father’s.