专题02 原因状语从句-2020-2021学年八年级英语下学期期末专项复习（仁爱版）

专题02 原因状语从句 第一部分 语法 原因状语从句 在复合句中，做原因状语的从句称为原因状语从句，可置于句首或句来。原因状语从句的引导词及用法的下所示: 常用引导词:because (因为) since (既然) as (因为) 用法 1、 because 表示造成某种情况的直接原因，引导的原因状语从句通常置于句来，语气最强 I didn't go surfing because it was too cold.我没有去冲浪，因为天气太冷了。 I can't go hiking with you because I have to help my mom with housework.我不能和你一起去远足，因为我得帮妈妈做家务。( 2、 since 表示已知或显然的原因，侧重强调主句内容，引导的原因状语从句通常置于句首，语气比because弱。 Since he was busy, he didn't come.因为他很忙，所以没来。 Since stress can make us sick, we have to learn how to deal with it.我们必须学会如何应对压力，因为它会使我们生病。 3、 as 表示对结果的附加说明，引导的原因状语从句通常置于句首或句末，语气比because和since弱。As the car was expensive, 1 we didn't buy it.因为这辆车很贵，所以我们就没有买它。 As it is often cold 1 in the mountains, 1 you need to wear warm clothes.由于山里经常很冷，所以你需要穿保暖的衣服。 注意： 1、 for引出的句子也可以表示原因，但不是状语从句，而是并列句，因为for是并列连词。 We listened eagerly,for he brought news of our family. 2、 because和so不能同时出现在同一个句子里面。因为because是从属连词，而so是并列连词。 第二部分 原因状语从句专项训练 一、单项选择 1．—Why was he late, Tom? —He was late ________ his clock didn't work, not ________ the bad weather. A．because; because of B．because of; because C．because; because D．because of; because of 2．Mr Smith is popular with the students ______ he always makes his class interesting. A．until B．while C．because D．although 3．I can’t understand the article________ there are many new words in it. A．so B．because C．though 4．________everyone is here, let's begin our discussion right away. A．If B．When C．Now that D．Even if 5．— Did you return Ted's call? — I did not need to________I will see him tomorrow. A．though B．unless C．because D．when 6．Mary didn't catch the first bus, ________ she got up late this morning. A．because B．so C．but D．or 7．________ everyone is here, we can begin our meeting now. A．When B．After C．Until D．Now that 8．I often watch English movies ________ it can help me improve my English. A．so B．but C．because D．or 9．I like sitcoms, ________ they’re funny and relaxing. A．so B．because C．but D．if 10．I didn’t go to the party not the cold weather but I didn