在连接词中还有4个常用的连接副词,① how 它的应用最广,如: how much, how many, how long, how soon, how old 。如: How much does it cost? ② when 它只是连接时间状语,如: Please tell me when the meeting will begin? ③ where 它连接地点状语,如: Where are you from? ④ why 它要连接的是原因状语从句,如: The teacher asked why Tom didn't come to school. 在考试中常见到的考点是:?
宾语从句的时态与主句时态的呼应问题。① 主句谓语动词如果是现在时或将来时,宾语从句的时态可以是任何所需要的时态, 如: I know he didn't come. 我知道他没来。 I know he will come tomorrow? 我知道他明天来。I know he has gone to London? 我知道他已去伦敦了。 ② 主句中的谓语动词若是过去时,宾语从句也要用过去时态中的某一种。比如: 一般过去时,过去进行时,过去将来时,过去完成时。除了在表达宇宙中的客观真理时,不能用现在时态。如: I wanted to know when he would come? The teacher told me the earth moves around the sun??状语从句主要有时间状语从句,其连接词有:after, before, when, as, as soon as, until (till), while, since, by?
其中较难掌握的有以下几点:?① until (till) 直到,在用 until 表达时间状语的句子中,主句中的动词是要十分小心去选择。如动词是持续性动词,它要用肯定句,如: I studied hard until 12 o'clock last night. 如果动词是瞬间截止性动词,则要用否定句,如: He didn't go to bed until his mother came back? ?② 由?since, for, by, before 来引导的时间状语从句。 since 引导的时间状语是动作的开始时间,如: I have studied English since 1990? 而由 by 引导的时间状语通常是动作的结束时间,如: I had learned 25 English songs by the end of last term? 而before 则多用于完成时, ago 则多用于一般过去时,如: He had finished his work before twelve yesterday? I left my hometown two years ago? ③ 在状语从句中用一般现在时或一般过去时表示将来。它们可能是主句用一般将来时,从句用一般现在时,如: If it rains, they won't go to the park on Sunday? 也可以主句是一般过去时,从句用一般过去进行时,如: He said if it rained the next day he would not go to the park?
【初中英语句子 必须掌握的主要句式讲解及例子分析】相关文章:
最新
2016-02-29
2016-02-29
2016-02-29
2016-02-29
2016-02-29
2016-02-29