since從句的用法

　　下面是小編整理的一些關(guān)于介詞since從句的用法的總結(jié)， 希望能幫助大家更好地認(rèn)識since從句，學(xué)好英語。

　　1. Since從句為非延續(xù)性動(dòng)詞的過去時(shí)或現(xiàn)在完成時(shí)，時(shí)間的起點(diǎn)應(yīng)該從從句動(dòng)作完成時(shí)刻算起。

　　例如：

　　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(fā)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(xù)性動(dòng)詞的一般過去時(shí)，表示動(dòng)作或狀態(tài)的結(jié)束。其含義與動(dòng)詞的詞義恰好相反，具有否定意味。

　　例如：

　　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(jīng)兩年了。

　　但如果since從句是延續(xù)性動(dòng)詞的現(xiàn)在完成時(shí)，則表示動(dòng)作由開始延續(xù)至說話的時(shí)候，具有肯定意味。

　　例如：

　　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(xiàn)代英語中，since從句是延續(xù)性動(dòng)詞的一般過去時(shí)，有時(shí)候也可以表示肯定意味。此時(shí)，多半用ever來加強(qiáng)since的語義。

　　例如：

　　She has known me ever since she was a child.

　　她從小就認(rèn)識我了。

　　I have live here ever since I was born.

　　我生下來就住在這里。