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來源：網絡資源 2023-09-23 23:17:09
從屬連詞when/after/before在引導狀語從句時應該怎么用?
when before after 從屬連詞定義
用來連接兩個子句：引導狀語從句，連接主句。
狀語從句必須依附主句，不能單獨存在。
狀語從句在前，主句在后，兩個句子中間必須加上逗號。
When 用法（當...的時候）
主句+when+狀語從句 = When+狀語從句，主句
When she has money, she likes to buy books.
當她有錢的時候，她喜歡買書。
I said hi to him when I saw him.
= When I saw him, I said hi to him.
當我看見他的時候，我對他說了聲嗨。
表示現在的習慣或狀態
主句(現在式)+ when + 狀語從句(現在式)
Peter likes to go jogging when he is free.
當Peter有空的時候，他喜歡去慢跑。
表示未來會發生的事
主句(未來式/祈使句)+ when +狀語從句(現在式)
I will give you a gift when you come here tomorrow.
當你明天來的時候，我將會給你一個禮物。
Be careful when you walk on the street at night.
當你夜晚走在街頭的時候，要小心。
表示過去發生的事情
主句(過去式)+ when + 狀語從句(過去式)
Sam went outside when he heard Tina screaming.
當Sam聽到Tina尖叫時，他跑到外面去。
My mom was cooking dinner when Vivian rang the doorbell.
當Vivian按門鈴時，我媽媽在煮晚餐。
after（在.…..之后）/ before（在.…..之前）用法
主句+after/before+狀語從句
= After/Before+狀語從句，主句
After he eats breakfast, he goes to work.
在他吃早餐之后，他去上班。
表示現在的習慣或狀態
主句(現在式)+ after/before + 狀語從句(現在式)
He watches TV after he finishes his work every night.
= After he finishes his work every night, he watches TV.
每天晚上，在他完成工作之后，他會看電視。
She brushes her teeth before she goes to bed.
= Before she goes to bed, she brushes her teeth.
她在上床睡覺之前會刷牙。
表示未來會發生的事
主句(未來式/祈使句)+ after/before +狀語從句(現在式)
I will give you a gift after you come here tomorrow.
在你明天來后，我將會給你一個禮物。
Before you have dinner, wash your hands.
在你吃晚餐前，先洗洗手。
表示過去發生的事
主句(過去式)+ after/before +狀語從句(過去式)
Tony had a big dinner with his family before he went to England.
=Before Tony went to England, he had a big dinner with his family.
在Tony去英國之前，他和他的家人吃了頓大餐。
Before和After當介詞用法
Before/After后面接名詞
He studies very hard before the test this time.
這次考試之前，他非常認真念書。
He bought many snacks before the field trip.
遠足前，他買了很多零嘴。
When/Before/After后面接動名詞
Before和After所引導從句，如果主語與主句相同時，去除從句的主語并將動詞改為動名詞。
After she ate dinner, she watched TV.
= After eating dinner, she watched TV.
吃完晚餐后，她看電視。
After she played the violin, she played basketball.
= After playing the violin, she played basketball.
彈完小提琴后，她打籃球。
Before she took the tests, she studied hard.
= Before taking the tests, she studied hard.
參加考試前，她用功念書。
Before you cook the vegetables, you must wash them.
= Before cooking the vegetables, you must wash them.
在烹煮蔬菜前，你必須先洗一洗。
When I watch TV, I usually have some popcorn.
= When watching TV, I usually have some popcorn.
當看電視時，我常常吃爆米花。
When I do the sports, I like to wear sneakers.
= When doing the sports, I like to wear sneakers.
當運動時，我喜歡穿運動鞋。
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