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课件网) Module 4 Seeing the doctor. Unit 3 Language in use. 1. I have been ill for about 3 days. 2. I have had him for 3 months now. 3. We have played football for a year now. 4. I haven't done much exercise since I got my computer last year. 5. Since then, it has become part of my life. Observe Observe the following sentences carefully. 本单元重点for和since 的用法 for + 一段时间 for 2 months for 3 years for 4 hours since 2005 since 3 years ago since he came here since+过去的时间点 for 和 since 在现在完成时中的应用 1. for与since都能与现在完成时连用， 但注意： since 3 years ago for 和 since 在现在完成时中的应用 二者可以转换 for + 一段时间 = since + 一段时间 + ago for 3 years = Mary learned to dance five years ago. How long has she learned to dance She has learned to dance for five years. now for 5 years = since 5 years ago five years ago She has learned to dance since five years ago. How long has he taught in this school He has taught in this school for 13 years. He has taught in this school since 13 years ago. 2017 2004 for 13 years Mr. Brown Mr. Smith became a doctor three years ago. Mr. Smith has became a doctor for three years. He has been a doctor for three years. 3 years ago for 3 years = since 3 years ago now became 是短暂性动词 不能延续3年 × 如： He has taught here since he came to China. 自从他来到中国就在这儿教书。 We have been friends since we met in school. 我们从在学校见面起就成为了好朋友。 3. since能引导时间状语从句(主句用现在完成时，从句用一般过去时)，而for则不能。 4. 均须与延续性动词连用，也可以与非延续性 动词的否定式连用。 如: I have bought this computer since four years ago. (×) I have had this computer since four years ago. (√) I haven’t bought anything for two months.(√ ) I haven't heard from him for 3 weeks. (√) 非延续性动词和延续性动词的转换 leave — be away borrow — keep buy — have begin/start — be on die — be dead finish -- be over open sth — keep sth open fall ill — be ill get up—be up, come here — be here, join — be in +组织机构 /be a member of + 组织机构, go there — be there, become — be, come back—be back, fall asleep — be asleep, get to/ arrive/reach — be (in), leave — be away from, get to know — know, go (get) out —tie out， put on—wear, catch a cold —have a cold, get married—be married 等。 The old man died 4 years ago. — The old man has been dead for 4 years. It is 4 years since the old man 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. 例如： 5. 二者引出的时间状语往往用 how long提问。 —How long have you had this book 这本书你买多久了 —For a week./Since a week ago. 买一周了。 总结：除表示经历、持续至今的行为或状态外，当我们需要强 调到目前为止持续的时间，或者到目前为止量的积累时， 通常使用现在完成时。 总结中强调现在完成时的语用意义。 I have been here _____five months ago. 2. He has been a so ... ...
