初中生英语词汇量 1. comebe here[误] He has come here for three hours.[正] He came here three hours ago.[正] He has been here for three hours.come是瞬间动词，不是延续性动词，在肯定句中不能与表示一段时间的状语连用。而要与表示一段时间的状语连用，就要用延续动词。与此同类的还有borrow/lend-keep; join-be in/at; die-be dead; buy-h