2019屆高考英語語法專題復習 句型整理
該是我們保護環境的時候了。
it was＋時間段＋before＋主語＋動詞過去時“過了多久，才…”，如：
it was three hours before he got there.
it will be＋時間段＋before＋主語＋動詞一般現在時“多久后，將…”，如：
it will be three years before we meet again. 三年后我們再相見。
it is/ has been＋since＋主語＋動詞過去式“自從…以來，已多久了”，如：
it is three years since he joined the army. 他入伍已三年了。
我感冒已四天了。
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自從我們上次見面以來已過了兩周。
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五年之后他就會再見你的。
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很久以后我們才會再見面。
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過不了多久我們的希望就會變成現實。
過了3年，我們才再次見面。
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參考答案
1. it is / has been four days since i caught a cold.
2. it is / has been two weeks since we met last.
3. it will be five years before he meets you again.
4. it will be long before we meet again.
5. it will not be long before we turn our hope into reality.
6. it was 3 year before we finally met again.