when before after從屬連接詞

作者:

when before after從屬連接詞定義

  • 用來連接兩個子句:引導副詞子句(從屬子句)，連接主要子句(獨立子句)
  • 副詞子句必須依附主要子句，不能單獨存在。
  • 副詞子句在前，主要子句在後，兩個句子中間必須加上逗號。

When 用法 (當…的時候)

主要子句 + when + 副詞子句.＝ When + 副詞子句, 主要子句.

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

主要子句 + when + 副詞子句.

現在簡單式       現在簡單式

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

主要子句 + when + 副詞子句.

未來式/祈使句       現在簡單式

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

主要子句+when+副詞子句.

過去簡單式          過去簡單式

過去進行式           過去簡單式

Sam went outside when he heard Tina screaming. 當Sam聽到Tine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…之後) / before (在…之前)

主要子句 + after / before + 副詞子句.＝After / Before + 副詞子句, 主要子句.

After he eats breakfast, he goes to work. 在他吃早餐之後，他去上班。

表示現在的習慣或狀態

主要子句 + after / before + 副詞子句.

現在簡單式             現在簡單式

He watches TV after he finishes his work every night.

= After he finishes his work every night, he watches TV.

每天晚上，在他完成工作之後，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

主要子句 + after / before + 副詞子句.

未來式/祈使句           現在簡單式

I will give you a gift after you come here tomorrow.

在你明天來後，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

主要子句 + after / before + 副詞子句.

    過去簡單式             過去簡單式

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當介系詞用法

1. Before和After後面接名詞(n)

He studies very hard before the test this time. (這次考試之前，他非常認真唸書)

He bought many snacks before the field trip.遠足前，他買了很多零嘴

When Before After後面接動名詞(Ving)

Before和After所引導從屬子句，如果主詞與主要子句相同時，去除從屬子句的主詞並將動詞改為動名詞。

After she ate dinner, she watched TV.

= After eating dinner, she watched TV.吃完晚餐後，她看電視

After she played the violin, she played basketball.

= After playing the violin, she played basketball.彈完小提琴後，她打籃球

Before she took the tests, she studied hard.

= Before taking the tests, she studied hard.參加考試前，她用功唸書

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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