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英语九年级【知识精讲】13.句法(25)原因状语从句 课件
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这是一份英语九年级【知识精讲】13.句法(25)原因状语从句 课件，共15页。PPT课件主要包含了条件状语从句，时间状语从句，状语从句，原因状语从句， 目的状语从句，结果状语从句，地点状语从句，比较状语从句，让步状语从句，方式状语从句等内容，欢迎下载使用。
原因状语从句的定义：在句中用来说明主句原因的句子叫原因状语从句。常用引导词: because (因为), as (由于), since (既然), fr (因为) 时态：原因状语从句一般都是根据实际情况选用适当的时态。通常是主过从过，主现从现。
Because引导的原因状语从句一般放于主句的后面，because从句位于句首时要用逗号分开，放在句末时，可不用逗号分开。 because表示直接原因， 语气最强， 最适合回答why引导的疑问句。because f 也表示原因，但它后面不接从句, 只能接名词, 代词或动名词。注意：because 和s 不可同时出现在一个句子里。
引导词 because
① I d it because I like it. = I like it s I d it. ② We went by bus because it was cheaper. = It was cheaper s we went by bus.③ Because he was tired, he culdn’t walk here.=He was tired, s he culdn’t walk here.
since “既然”表示对方已知或客观的事实或理由，常放在句首，较为正式， 语气比because弱。① Since yu’re interested in English, why nt have a try in the English Speech Cntest?② Since yu are free tday, yu had better help me with my mathematics.③ Since yu dn’t trust him, yu shuld nt emply him.
as 引导原因状语从句时表示附带说明的“双方已知的原因”，含有对比说明的意味，语气比since弱，较为正式，位置较为灵活(常放于主句之前)。① As he is ill, he can’t cme t the meeting.② As yu weren’t there, I left a message.③ As yu are tired, yu had better rest.
fr 引导的是并列句表示原因但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。fr引导的并列句只能放于主句之后并且必须用逗号将其与主句隔开。① It must have rained last night, fr the grund is wet.② He culd nt have seen me, fr I was nt there.③ He seldm ges ut nw, fr he is very ld.
Why didn’t yu cme?--- ______my father wuld nt let me.
Why didn’t yu cme?--- ______my father wuld nt let me.答案：Because
单项选择。________ yu knw little abut the Sng Dynasty, yu'd better find a bk t learn mre.A. Unless B. While C. Thugh D. Since
单项选择。________ yu knw little abut the Sng Dynasty, yu'd better find a bk t learn mre.A. Unless B. While C. Thugh D. Since答案：D
原因状语从句的定义：在句中用来说明主句原因的句子叫原因状语从句。常用引导词: because (因为), as (由于), since (既然), fr (因为) 时态：原因状语从句一般都是根据实际情况选用适当的时态。通常是主过从过，主现从现。
Because引导的原因状语从句一般放于主句的后面，because从句位于句首时要用逗号分开，放在句末时，可不用逗号分开。 because表示直接原因， 语气最强， 最适合回答why引导的疑问句。because f 也表示原因，但它后面不接从句, 只能接名词, 代词或动名词。注意：because 和s 不可同时出现在一个句子里。
引导词 because
① I d it because I like it. = I like it s I d it. ② We went by bus because it was cheaper. = It was cheaper s we went by bus.③ Because he was tired, he culdn’t walk here.=He was tired, s he culdn’t walk here.
since “既然”表示对方已知或客观的事实或理由，常放在句首，较为正式， 语气比because弱。① Since yu’re interested in English, why nt have a try in the English Speech Cntest?② Since yu are free tday, yu had better help me with my mathematics.③ Since yu dn’t trust him, yu shuld nt emply him.
as 引导原因状语从句时表示附带说明的“双方已知的原因”，含有对比说明的意味，语气比since弱，较为正式，位置较为灵活(常放于主句之前)。① As he is ill, he can’t cme t the meeting.② As yu weren’t there, I left a message.③ As yu are tired, yu had better rest.
fr 引导的是并列句表示原因但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。fr引导的并列句只能放于主句之后并且必须用逗号将其与主句隔开。① It must have rained last night, fr the grund is wet.② He culd nt have seen me, fr I was nt there.③ He seldm ges ut nw, fr he is very ld.
Why didn’t yu cme?--- ______my father wuld nt let me.
Why didn’t yu cme?--- ______my father wuld nt let me.答案：Because
单项选择。________ yu knw little abut the Sng Dynasty, yu'd better find a bk t learn mre.A. Unless B. While C. Thugh D. Since
单项选择。________ yu knw little abut the Sng Dynasty, yu'd better find a bk t learn mre.A. Unless B. While C. Thugh D. Since答案：D
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