be动词后可以加情态动词么

问题描述:

be动词后可以加情态动词么
we will ----- a lot of things for our puppies.
这里的横线上是填need buy还是need to buy
再想问一下是at the palace还是in the palace

不可以
need to buy
need 在这是实义动词.情态动词need 不用于肯定句,一般用于否定句和疑问句
at the palace还是in the palace主要决定上下文.孤立地看,两者都没毛病