第六讲 状语从句时间原因类 讲义-2025届高三上学期英语一轮复习专项

when, while, as when, while, as都可译为“当...的时候”但侧重点不同。 当主句动作时瞬时的,从句动作时延续的时,三者都可用。 as强调主、从句动作同时或几乎同时发生。 while从句的谓语动词必须时延续性动词。 Eg:She sang as we walked. I listened carefully while she was singing. 1.1.2. until和not...until until要与延续性动词连用;not...until要与非延续性动词连用。 Eg:He completed her last novel in 1816, but it was not published until after her death. 1.1.3. since since意为“自从...以来”,其后面所用动词不同,该动词所表示动作持续时间的计算方法也不同。 Eg:It is two years since he smoked. 1.1.4. 特殊的时间状语从句引导词 the moment, the minute, the instant, the second, no sooner ...than..., hardly...when...等以及表示瞬间的directly, immediately等词,表示“一...就...”,相当于as soon as。no sooner...than...,hardly...when...结构中,no sooner和hardly引导的句子通常用过去完成式,而than和when所引导的句子通常要用一般过去式;此外,no sooner和hardly位于句首时,句子应用部分倒装语序。 Eg:Hardly had I got home when it began to rain. 1.1.5. by the time by the time也可以引导时间状语从句,意为“到...时为止”,主句一般用完成时。 Eg:By the time he was fourteen, he had learned some difficult classes by himself. 1.1.6. 几组固定形式 (1).It will be+一段时间+before...多久之后才... Eg:It will be ten years before the buildings are constructed. (2).It is+一段时间+since...自从...以来已有多长时间了。 Eg:It is three years since I came here. (3).be about to do...when...;be doing...when...;on the point of doing...when...正在/要做...这时... Eg:I was about to go out when the phone rang. 1.2. 原因状语从句 常用连接词:because, as, since, now that... 1.2.1. because为常用词,其语气最重,且说明的是直接原因,用来回答why引导的问句。 1.2.2. as, since和now that语气较弱,常用来表示一些显而易见或对方知道的原因。since译为“既然,鉴于”时不可用as替换。 Eg: As it’s raining, you’d better take a taxi. 2. 解题思路: Step 1: 寻找主句从句 Step 2: 判断主从句之间的逻辑关系 Step 3: 根据所选的逻辑关系选择合适的连接词