need 和dare在疑问句和否定句中必须是情态动词吗?

need 和dare 既可作情态动词,又可以作为一般实意动词来用.区别在于作为实意动词时它们有人称、时态和数的变化,否定和疑问时要加助动词；作为情态动词时不论什么人称和时态时都用其原形不变化.同时,作为实意动词,其后要接to do ... 例如：I need to have a rest. She doesn't dare to go there. Did you need to see him?
而情态动词后只能接原形动词：How dare she do that? You need come on time. She dare not go there.

不。这两个词作情态动词时常用在否定句和疑问句中，但是它们也做实意动词，可以用在肯定句，疑问句和否定句中。关键是要语法形式要正确。
如：I daren't go out at night alone.
=I don't dare to go out at night alone.
You needn't go home.
=You don't need to go h...

need 和dare 既可作情态动词，又可以作为一般实意动词来用。区别在于作为实意动词时它们有人称、时态和数的变化，否定和疑问时要加助动词；作为情态动词时不论什么人称和时态时都用其原形不变化。同时，作为实意动词，其后要接to do ...