英语一些短语词组的用法区别:need+v-ing和+to do的区别,be supposed to do还是be supposed to be doing?

英语一些短语词组的用法区别:need+v-ing和+to do的区别,be supposed to do还是be supposed to be doing?

题目
英语一些短语词组的用法区别:need+v-ing和+to do的区别,be supposed to do还是be supposed to be doing?
答案
need sth doing是某物需要什么
如The meat need cutting
sb need to do是某人需要干什么
如I need to ask my teacher for answer
至于be supposed to do和be supposed to be doing
是时态不同
be supposed to do是一般现在时
be supposed to be doing
是现在进行时
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