We'd need = would need.其中 would 是情态动词,need 是实意动词.
need 有两种属性:实意动词和情态动词.虽然意思都是 “需要”,但是用法不同.
1.实意动词
可以作谓语动词,有人称变化(need/needs)和各种时态变化(need,needed,have needed,will need 等)
后面跟名词、不定式或动名词作宾语,如:
Does he need any help?他需要帮忙吗?
You don't need to be told twice.不必告诉你两遍.
My car needs repairing.我的车需要修理.
可以用在肯定、否定或疑问句中
2.情态动词
只能用在动词原形前,不能单独作谓语动词;有紧缩的否定形式 needn't,疑问句需要提前到句首
无人称变化,本身无时态变化,过去时用 had to 代替,将来时用 will have to 代替
You need not 代替)
只用于否定句、疑问句或条件句,如;
You need not come today. 今天你不必来.-
Need we make the test? 我们需要做这个试验吗?
He needn't have done it. 他本不需要做这件事.