Things have changed a lot since I wrote to you last time.

　　自我上次給你寫信之后，情況已發生了很大的變化。

　　She has lived with us since she has come here.

　　自從她來到這里，就一直和我們住在一起。

　　2. Since從句為延續性動詞的一般過去時，表示動作或狀態的結束。其含義與動詞的詞義恰好相反，具有否定意味。

　　All has changed since he was at home.

　　自從他離開家以后，這里的一切都變了。

　　I haven’t written to her since she lived in London.

　　自從離開倫敦以來，我還沒有給她寫過信。

　　He has never been to see me since I was ill.

　　自從我病愈以來，他一直沒有來看我。

　　Two years have passed since I last smoked.

　　我戒煙已經兩年了。

　　但如果since從句是延續性動詞的現在完成時，則表示動作由開始延續至說話的時候，具有肯定意味。

　　He has never been to see me since I have been ill.

　　自從我生病以來，他一直沒有來看我。

　　She has talked little since she has stayed at home.

　　自從她呆在家里以后，就很少講話。

　　Since we have owned a car， we have gone camping every year.

　　自從我們有了汽車后，年年都去野營。

　　3. 在現代英語中，since從句是延續性動詞的一般過去時，有時候也可以表示肯定意味。此時，多半用ever來加強since的語義。

　　She has known me ever since she was a child.

　　她從小就認識我了。

　　I have live here ever since I was born.

　　我生下來就住在這里。

　　4. 在it is+時間+since從句結構中，since從句是非延續性動詞的一般過去時，含有肯定意味。

　　It is three years since her husband left her.

　　她丈夫離開她已經3年了。

　　It is over sixty years since the People’s Republic of China was established.

　　中華人民共和國已經成立60多年了。

　　5. 在it is+時間+since從句結構中，since從句是延續性動詞的一般過去時，含有否定的意味。

　　It is three years since she stayed here.

　　她離開這里已經3年了。

　　How long is it since you were a league member?

　　你退團有多久了?

　　6. 在it is+時間+since從句結構中，since從句是現在完成時或過去完成時，均含有否定意味。

　　It is five years since we have seen her.

　　我們已經5年沒有見她了。

　　It was years since I had seen her.

　　在那之前，我已經有好久沒有見到她了。

　　It’s been a long time since I’ve seen you.

　　我已經很久沒有見到你了。

　　另外，①根據英語慣用法，since從句不可以否定形式出現。

　　It is four years since I have smoked a cigarette. 我已經4年不抽煙了。

　　不可說：It is four years since I haven’t smoked a cigarette.

　　但由于下句中的since不作“自從”解，所以從句可以用否定形式。

　　I haven’t been out anywhere since I don’t know how long.

　　也不知多久了，我哪兒也沒去過。

　　②Since從句通常不與非延續性動詞的現在完成時的肯定式連用。

　　Her mother died when she was a child.

　　她小時候母親就去世了。

　　不可說：Her mother has died since she was a child.

　　③Since前不可加表示時間的詞語，但可以與ago連用。

　　She has lived with us since her mother died three years ago.

　　自從她母親3年前去世，她就一直和我們住在一起。

　　不可說：She has lived with us three years since her mother died.

　　④在It was five years ago since his father died. 一句中的since用錯了，因為在含有ago的時間范疇里，已經有了從過去的一個時間點以來的時間，即已有了since的時間范疇，所以再用since是多余的。

　　改為：

　　It was five years ago that his father died.

　　他父親5年前去世了。

　　It is five years since his father died.

　　他父親去世已經5年了。

　　以上就是學習啦小編為大家帶來的高考英語since從句的用法考點復習，供大家參考學習!