don't
need
to
do
与needn't
do
有什么区别?
有一定的区别:
don't
need
to
do
这里need是个行为动词,而needn't中的need是情态动词;
needn't应该相当于don't
have
to
更好
还有needn't
是否只能用于一般现在时?
是的,一般只用于一般现在时,但在宾语从句中也可表示过去或将来(不太常见)。
用法和can一样
need
to
do与don'need
do和
needn't
do中的need
都是情态动词;t
need
to
do中的need
都是行为动词
need
do
情态动词后面加动词原形
need
to
do
实义动词
后面加to
do
need
do
有必要做某事
needn't
do
没必要做某事
need
to
do
需要做某事
don't
need
to
do
不需要某事
need
somebody
do
某人有必要某事