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conj (1)自從……以后(來(lái))(from a certain time till now or till a later past event)(主句通常用現(xiàn)在完成時(shí)、過(guò)去完成時(shí)或一般現(xiàn)在時(shí)，從句用過(guò)去時(shí)或現(xiàn)在完成時(shí))：He has been at home (ever)～he returned from America. 自從美國(guó)回來(lái)以后他就一直待在家里。I have been working (ever)～I(xiàn) finished my breakfast. 自從吃完早飯以后我就一直工作。He came at last. I had been waiting for him for an hour～you left. 他終于來(lái)了。自你們走后我又等了他一小時(shí)。It's a long time～we met last. 我們已經(jīng)很長(zhǎng)時(shí)間沒(méi)有見(jiàn)面了。It was ages～I(xiàn) had my last meal，and I was very hungry. 上一頓飯已經(jīng)吃過(guò)好長(zhǎng)時(shí)間了，我餓極了。I've known her～I(xiàn)'ve lived in this street. 自從我住到這條街上，我就認(rèn)識(shí)她了。

(2)因?yàn)椋热?because;as)：S～he was busy，he didn't come to the party. 他因?yàn)槊](méi)有來(lái)參加那個(gè)聚會(huì)。Aircraft noise is a problem～we are close to the airport. 由于我們靠近機(jī)場(chǎng)，飛機(jī)噪音就成了一個(gè)問(wèn)題。S～you're not interested，I won't tell you about it. 既然你不感興趣，我就不告訴你那件事了。

prep 自從……以后(來(lái))(from a certain time till now or till a later past time)[通常與現(xiàn)在完成時(shí)、過(guò)去完成時(shí)或一般現(xiàn)在時(shí)連用]：She has never spoken to him～then/last week. 從那時(shí)/上周以來(lái)她就沒(méi)有和他說(shuō)過(guò)話(huà)。 It's been raining～two o'clock. 從兩點(diǎn)起天就一直在下雨。I met her last Christmas，but I had known her by sight～1995. 我是在去年圣誕節(jié)時(shí)認(rèn)識(shí)她的，但是我從1995年起就和她見(jiàn)過(guò)面。It's a long time～the last meeting. 自從上次會(huì)議以來(lái)已經(jīng)過(guò)了好長(zhǎng)時(shí)間了。It was ages～my last meal，and I was very hungry. 上一頓飯已經(jīng)吃過(guò)好長(zhǎng)時(shí)間了，我餓極了。

adv 從那時(shí)起，后來(lái)(from then till now or a later past time)[與現(xiàn)在完成或過(guò)去完成時(shí)連用]：He left here five years ago and I haven't seen him (ever)～. 他五年前離開(kāi)這里，從那時(shí)起我就再也沒(méi)有見(jiàn)過(guò)他。I bought a new car two years ago but I've～sold it. 兩年前我買(mǎi)了一輛新車(chē)，但是后來(lái)我又賣(mài)了。

【辨異】since與as、because和for的區(qū)別見(jiàn)AS。