摘要:引导条件状语从句的连词有if.它相当于“if ... not ,as等. 例题:We’ll go to visit Tian’anmen Square it doesn’t rain tomorrow. A. if B. as soon as C. when D. since 主从句的时态呼应1. 当状语从句表示将来时.在when, after, before, until, as soon as等引导的时间状语从句和if引导的条件状语从句中.从句通常不用一般将来时.而用一般现在时. 例题:Don’t leave until he back. A. have come B. comes C. will come D. came

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