這是我的教案,供你參考：
since的用法：譯作“自從…以來”
(1)接時間點：如 I have stayed in that country since 1995.要求：謂v.用現(xiàn)在完成時,而且須是延續(xù)性動詞.
(2)接一段時間 + ago：如 They have lived in that house since two years ago.要求：謂v.用現(xiàn)在完成時,而且須是延續(xù)性動詞.
(3)接時間狀語從句：如 I have loved her since I met her last time./ Lily has stayed at home since she left school.要求：主句的謂v.用現(xiàn)在完成時,而且須是延續(xù)性動詞；從句的謂v.用一般過去時,而且須是終止性動詞.
(4)用于句型“It’s / It has been + 一段時間 + since + 時間狀語從句”中,譯作“自從…以來,已經(jīng)…(時間)了”.如 It’s / has been three months since he moved to this city.要求：主句的謂v.用一般現(xiàn)在時或現(xiàn)在完成時；從句的謂v.用一般過去時,而且須是終止性動詞.
(5)用于句型“一段時間 + has passed since + 時間狀語從句”中,譯作“自從…以來,…
(時間)已經(jīng)過去了”.如上個例句還可寫成：Three months has passed since he moved to this city.要求：主句的謂v.用現(xiàn)在完成時,而且動詞必須是has passed；從句的謂v.用一般過去時,而且須是終止性動詞.
(6)注：當since用于否定句時,主句的謂v.可以是終止性動詞.如 He hasn’t seen the film since last month.
(7)相關詞組：“從那時起”：ever since、since then、from then on.
注：ever since作為一個詞組,放句尾可單獨使用.如I have given up smoking ever since.另外,還可在since后接句子.since前加ever,只是加重語氣而已.如 I have given up smoking ever since I caught a bad cough.
(8) since還可引導原因狀語從句,譯作“由于；因為”,相當于because.如 Since he was lazy,he didn’t finish his homework.
希望我的回答能夠幫到你,