如何区分need是情态动词还是实义动词

看need后动词是原形还是to
do
结构。
如果是原形，need是情态动词；如果是to
do
结构，那么这是need是实义动词
。

情态动词加动词原形，，否定时直接加not，疑问句时可提前
She
need
drink
some
water.
She
needn't
drink
any
water.
Need
she
drink
any
water?
What
does
she
need?
实义动词后加to
do或doing或名词，主语是第三人称时要加s,否定疑问要用助动词do/does
She
needs
to
drink
some
water.
She
doesn't
need
to
drink
any
water.
She
needs
some
water.
Does
she
need
any
water?
need
to
do
sth
需要做某事
need
doing
sth
需要被做某事
The
flowers
need
watering
every
day.花需要每天浇水
=The
flowers
need
to
be
watered
every
day.

这个问题很简单，当need后接的是不定式或者动名词形式时，他就是示实意动词。当它放在句首来提问时就是以情态动词出现的，如:Need
I
go
to
shool
early
tomorrow?
yes,you
need;
no
you
needn"t