This.is.called.a.dog.这个被称为狗。句子中called(被称为)后边不可加上to.be。但可说成said.to.be。seem:好象,后边to.be可用可不用。但become(成为)后边不可加to.be。只可说You.become.tired.
collect意思是收集,集中起来,它和副词together:集合起,总合地,意思相近,不可用在同一句子里,如:Who.collected.these.books?谁收集了这些书?另外,gather.join.meet.join…等,后面都不可加together
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