它的謂語動詞按主語是複數用。
she and her friends是由並列連詞and連接的並列主語,是複數,謂語動詞要按主語為複數用的。例如
She and her friends are all Chinese(她和她的朋友們都是中國人). 句中的謂語動詞就用了表示複數的系動詞are.
she and her friends謂語用什麼
因為主語Sue and her friends 整體看相當於they,後面的謂語動詞顯然是動詞原形形式。
【and/both~and~】連接兩個單數名詞作主語時,指代複數概念,謂語動詞用複數
如:She and her friend are watching TV。 
She and her friends are at the fair. 
當主語後面跟有with, together with, like, except, but, no less than, as well as 等詞引起的短語時,謂語動詞與前面的主語一致。   如:
The teacher together with some students is visiting the factory。  
He as well as I wants to go boating, as did most of her friends
she and her friends謂語用什麼
she and her friends是複數,謂語動詞用原形,如果是一般過去時,謂語動詞用過去式,如果是一般將來時,謂語動詞用will+動詞原形