15.3 謂語動詞與前面的主語一致
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  當主語后面跟有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。
  The teacher together with some students is visiting the factory.
  He as well as I wants to go boating.