延续性

方式。 ，成为可以延续的状态，因而可与表示一段时间的状语连用。 如： He hasn39。 t left here since 1986. I haven39。 t heard from my father for two weeks. until/till 连用，构成 not+终止性动词 +until/till ...的句型，意为 直到……才……。 如： You can39。 t leave

died. Four years has passed since the old man died. He joined the Party 2 years ago. He has been in the Party for 2 years. I bought the book 5 days ago. I have had the book for 5 days. 补充练习： 1. When

— have a cold 8. begin start 9. put on — wear 10. buy — have 11. borrow — keep 12. bee — be 13. fall asleep — be asleep be on 3 14. fall ill be i