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,而 because of后接名詞、代詞等,它的后面不能接句子。 eg. He cannot go to school because of his illness. b. 由 as “因?yàn)椋捎凇? 引導(dǎo)的原因狀語從句 as引導(dǎo)的原因狀語從句表示原因的語氣比because從句要弱一些,有順便提一下的意味。 eg. Everyone likes you as you are both kind and honest. 人人都喜歡你,因?yàn)槟慵群蜌?,又誠實(shí)。 c. 由 since“因?yàn)?,既然? 引導(dǎo)的原因狀語從句 since引導(dǎo)的原因狀語從句表示經(jīng)過一些分析,且聽話對(duì)方已知曉原因。 eg. Since she insists you must e. 既然她堅(jiān)持,你就一定要來。 III. 條件狀語從句 (Adverbial Clause of Condition) 條件狀語從句常用 if unless“除非,如果不”, as/as long as “只要”等詞引導(dǎo)。 eg. If it rains on Sunday, we will not go on a trip. 如果這個(gè)星期日下雨的話,我們就不外出旅行。 You’ll fail unless you work hard. 除非你積極工作,不 然你總要失敗。 You can surely overe these difficulties so long as we are closely united. 只要我們緊密地團(tuán)結(jié)一致,一定能克服這些困難的。 條件狀語從句中一般不用將來時(shí) 在表示將來要發(fā)生的動(dòng)作時(shí),要用將來時(shí)態(tài)。但是,在條件狀語從句中常用一般現(xiàn)在時(shí)態(tài)而不用一般將來時(shí)態(tài)。 Eg. If you go to England next year, you’ll learn a lot of English. If Carol es here tomorrow, I’ll tell her all about it. IV. 讓步狀語從句 although, though, even if (并列連詞: but) Tom still doesn’t understand. I have explained three Although / Though I have explained three times, Tom still doesn’t understand. 二、主句謂語動(dòng)詞的幾種不同形式 1)主句中的謂語形式通常是: will + 動(dòng)詞 eg. If we leave now, we’ll catch the 11:30 train. I’ll give you another book if you don’t like this one. 2)在表示客觀真理,自然規(guī)律等時(shí),主句中的謂語動(dòng)詞可以用一般現(xiàn)在時(shí)。 Eg. If you heat