1、中文：我习惯于早起。

(误)I am used to get up early.

(正)I am used to getting up early.(get，become或be used to中的to是介词，后接动名词。)

2、中文：他过去常常在星期天来约我。

(误)He used to calling on me on Sundays.

(正)He used to call on me on Sundays.(used to+原形动词，表示过去常常。)

3、中文：A：我必须去吗?B：不，你不必了。

(误)A： Must I go? B： No，you mustn't.

(正)A： Must I go? B： No，you needn't.(mustn't表示不许，needn't表示不必，以MUST开始的一般疑问句，否定回答用needn't.)

4、中文：我今天下午想和你一起去游泳。

(误)I will like to go swimming with you this afternoon.

(正)I would like to go swimming with you this afternoon.(would like是习惯搭配，后接不定式，表示愿意做某事。)