在中学英语中,状语从句是很常见的。本文拟谈一谈if,when,since引导的状语从句。1.if可用作从属连词,意为“如果”,常用来引导条件状语从句。若主句为一般将来时,在if引导的条件状语从句中,谓语动词常用一般现在时来表示将来时间。例如:If it doesnt rain tomorrow,we will go In middle school English, adverbial clauses are very common. This article is about to talk about the if, when, and since adverbial clauses. 1.if can be used as a subordinate conjunction, meaning “if”, to guide conditional adverbial clauses. If the main sentence is the general future, in the conditional adverbial clause of the if guidance, the predicate verb is usually expressed in the present time. For example: If it doesnt rain tomorrow, we will go