實(shí)意動(dòng)詞,情態(tài)動(dòng)詞------共2種類
she needs to buy a book.
she doesn't need to buy a book.
does she need to buy a book?
what does she need to do?
實(shí)意動(dòng)詞用法,用助動(dòng)詞提問(wèn)
she need buy a book.
she needn't buy a book
need she buy a book?
what need she do?
情態(tài)動(dòng)詞用法,直接對(duì)情態(tài)動(dòng)詞本身提問(wèn)
但是情態(tài)動(dòng)詞need多用于否定和疑問(wèn)
所以句一,是為了舉例,一般不用,剩下的3個(gè)是常用的,否定和疑問(wèn)
i need be more careful