unit1現(xiàn)在完成時態(tài)(編輯修改稿)
2025-08-18 10:02 本頁面
【文章內(nèi)容簡介】 just finish) searching the area. have studied have lived have read has finished have just finished ? 現(xiàn)在完成時的時間標(biāo)志 ? 1不表示具體或確定時間的 一些狀語往往可成為現(xiàn)在完成時的標(biāo)志。 ? （ 1） already和 yet already一般用于肯定句中，yet一般用于否定句和疑問句中。 ? （ 2） ever和 never 多用于否定或疑問句中，表示“曾經(jīng)”或“從未”等。 ? Have you ever seen any aliens by yourself? ? I have never seen any aliens. ? (3) 表示到說話為止的過去時間狀語 ，如 just，before， up to now， the past few years等。 ? He has been taken away by aliens before and he still has nightmares of that now. ? ? (4) 包括“現(xiàn)在”在內(nèi)的時間狀語 。如：now,today,this morning/month/year/term等。 ? Have you met him this term? ? No,I haven’t. ? since或 for等表示“一段時間”的狀語。 ? I haven’t seen my mother for two years and I miss her very much. ? 關(guān)于現(xiàn)在完成時的幾點補充 ： ? （ 1）現(xiàn)在完成時常與 since連用，表示“自 …… 以來” ,一直進行或者未進行某項活動，在 since分句中，通常用非持續(xù)性動詞的一般過去時，主句中的動詞常用現(xiàn)在完成時，如果主句為表示時間長度的 it be句型，動詞可用一般現(xiàn)在時代替現(xiàn)在完成時。 ? It is three months since he wrote to me. ? It is three months since he wrote to me. ? It is three months since he wrote to me. 2)在 It/ That/ This is the first time +(that)從句中 ,當(dāng)主句謂語為 is/will be時 ,that從句中的動詞用現(xiàn)在完成時 . ? It is the first time that I’ve been here. ? 當(dāng)主句動詞為 was時 ,that從句中的動詞通常用過去完成時 . ? It was the first time this year that he hadn’t worked on Saturday. ?這是我第一次上網(wǎng)沖浪
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