have作为行为动词,用法就和一般的动词没区别了,否定为don't have, 根据不同的时态、句子还有doesn't have, won't have, shouldn't have 等等。
作为助动词时,否定为haven't, 根据不同的句子、时态等有hasn't , hadn't 等。
need 作为行为动词时,和一般动词用法一样。如,
we need to buy some books.
否定为 we don't need to buy any book.
注意不能忘了加一个“to”
need也可以作为情态动词使用。应该这样表达上面的句子。
we need buy some books.
否定为 you needn't buy any book.
这是不能有 “to”,need后面直接跟动词。
追问we need buy some books.
we need to buy some books.这两句有什么差别吗
还有need做助动词给否定怎么表达
追答这两句话都是对的.
we need buy some books. 这里need是情态动词,后面直接跟动词原形buy。改成否定时,情态动词need改成needn't. 就像can改成can‘t 一样
we need to buy some books.这里need是常规的行为动词。后面跟动词不定式。改成否定时,常规动词改成don't need.