【编者按】威廉希尔app 英语四六级频道为大家收集整理了“大学英语四级考试语法词汇的用法辨析”供大家参考，希望对大家有所帮助!
英语四级语法词汇用法：
1) need表示需要，主要用于否定句和疑问句。用于疑问句，肯定回答用must，否定回答用needn't。have to表示他人或客观情况要求“必须”，也可以翻译为“不得不”，have to否定形式意思是“不一定”或“没有必要”。
【例如】
You needn't come if you don't want to.
I don't think you need be so polite to her.
You don't have to work so hard if you just want to pass Band 4.
Because of the heavy rain, the children have had to get up earlier than usual this week.
It was very kind of you to do the washing-up, but you ____it. (CET-4 1998,6)