延續動詞與瞬間動詞
1) 用於完成時的區別 延續動詞表示經騐、經歷; 瞬間動詞表示行爲的結 果,不能與表示段的時間狀語連用。 He has completed the work. 他已完成了那項工作。 (表結果) I've known him since then. 我從那時起就認識他了。(表經歷)
2)用於till / until從句的差異 延續動詞用於肯定句,表示"做……直到……" 瞬間動詞用於否定句,表示"到……,才……" He didn't come back until ten o'clock. 他到10 點才廻來。 He slept until ten o'clock. 他一直睡到10點。
典型例題 1. You don't need to describe her. I ___ her several times. A. had met B. have met C. met D. meet 答案B. 首先本題後句強調對現在的影響,我知道她的模樣,你不用描述。再次,several times告知爲反複發生的動作,因此用現在完成時。
2.---I'm sorry to keep you waiting. ---Oh, not at all. I ___ here only a few minutes. A. have been B. had been C. was D. will be 答案A. 等待的動作由過去開始,持續到現在,應用現在完成時。