2023年中考英语语法专项之状语从句（原因条件让步）知识点及习题

状语从句 2 · 原因状语从句 · 原因状语从句的概念：在复合句中，用于说明主句原因的句子。 e.g. The doctor looks tired and sleepy because he sat up all night with patients. e.g. I need to go to bed now, since I feel exhausted. · 原因状语从句常见的连接词： 1.because 因为（重在原因） because引导的从句一般在主句后， because表示直接原因，语气最强，最适合回答 why 引导的疑问句。 I do it because I like it. Just because he does not want to obey commands from school, he wants to drop out. You are chosen to attend the conference because you are excellent in studying. · 积累：because的同义短语 because of：We are late because of the bad traffic. due to：He didn’t go to the meeting due to the storm. thanks to：The problem has been solved thanks to your advice · 辨析：because和because of的区别 1.短语because of 也表示原因，但它后面不接从句, 只能接名词, 代词或动名词。 He can’t go to school because he is ill. He can’t go to school because his illness. The road is closed _________the snow. Take plenty of breaks, __________they offer a double bonus. · 易错点： because 和so 不可同时出现在一个句子里。 I do it because I like it. = I like it so I do it. We went by bus because it was cheaper. = It was cheaper so we went by bus. 2.since由于；因为（重在结果） since引导的从句一般在主句之前，表示已知的、显然的理由，译为:“因为…，既然…，鉴于…””，语气比because弱。 Since you spent too much, I will limit your spending. Since the rain has stopped，let’s go for a walk.     Since we are young，we shouldn’t be too afraid of making mistakes. Since (As) we’ve no money, we can’t buy it. 3.as 因为，既然（重在结果） as 引导从句表示附带说明的“双方已知的原因”，语气比since弱，位置较为灵活(多在主句前)。 As it is raining, you’d better take a taxi. As you are tired, you had better rest. I went to bed early, as I was exhausted. As it is too late, let take the plane instead of the train. 4.for 因为（表猜测的原因） for引导的从句并不说明主句行为发生的直接原因，只提供一些辅助性的补充说明或情况加以推断，for从句只能在主句后，并用逗号与主句隔开。 He could not have seen me, for I was not there. He must be ill, for he is absent today. He must be at home yesterday, for it rained heavily. I think it is morning now, for the birds are singing. · 特殊的连接词： now (that) 鉴于某个事实, 既然 in that 鉴于某个事实, 既然 seeing (that) 鉴于某个事实, 既然 considering (that)鉴于某个事实, 既然 given (t