從屬連詞when/after/before在引導(dǎo)狀語(yǔ)從句時(shí)應(yīng)該怎么用?
when before after 從屬連詞定義
用來(lái)連接兩個(gè)子句：引導(dǎo)狀語(yǔ)從句，連接主句。
狀語(yǔ)從句必須依附主句，不能單獨(dú)存在。
狀語(yǔ)從句在前，主句在后，兩個(gè)句子中間必須加上逗號(hào)。
When 用法（當(dāng)...的時(shí)候）
主句+when+狀語(yǔ)從句 = When+狀語(yǔ)從句，主句
When she has money, she likes to buy books.
當(dāng)她有錢的時(shí)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(dāng)我看見(jiàn)他的時(shí)候，我對(duì)他說(shuō)了聲嗨。
表示現(xiàn)在的習(xí)慣或狀態(tài)
主句(現(xiàn)在式)+ when + 狀語(yǔ)從句(現(xiàn)在式)
Peter likes to go jogging when he is free.
當(dāng)Peter有空的時(shí)候，他喜歡去慢跑。
表示未來(lái)會(huì)發(fā)生的事
主句(未來(lái)式/祈使句)+ when +狀語(yǔ)從句(現(xiàn)在式)
I will give you a gift when you come here tomorrow.
當(dāng)你明天來(lái)的時(shí)候，我將會(huì)給你一個(gè)禮物。
Be careful when you walk on the street at night.
當(dāng)你夜晚走在街頭的時(shí)候，要小心。
表示過(guò)去發(fā)生的事情
主句(過(guò)去式)+ when + 狀語(yǔ)從句(過(guò)去式)
Sam went outside when he heard Tina screaming.
當(dāng)Sam聽(tīng)到Tina尖叫時(shí)，他跑到外面去。
My mom was cooking dinner when Vivian rang the doorbell.
當(dāng)Vivian按門鈴時(shí)，我媽媽在煮晚餐。
after（在.…..之后）/ before（在.…..之前）用法
主句+after/before+狀語(yǔ)從句
= After/Before+狀語(yǔ)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(xiàn)在的習(xí)慣或狀態(tài)
主句(現(xiàn)在式)+ after/before + 狀語(yǔ)從句(現(xiàn)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(huì)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(jué)之前會(huì)刷牙。
表示未來(lái)會(huì)發(fā)生的事
主句(未來(lái)式/祈使句)+ after/before +狀語(yǔ)從句(現(xiàn)在式)
I will give you a gift after you come here tomorrow.
在你明天來(lái)后，我將會(huì)給你一個(gè)禮物。
Before you have dinner, wash your hands.
在你吃晚餐前，先洗洗手。
表示過(guò)去發(fā)生的事
主句(過(guò)去式)+ after/before +狀語(yǔ)從句(過(guò)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(guó)之前，他和他的家人吃了頓大餐。
Before和After當(dāng)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(rèn)真念書。
He bought many snacks before the field trip.
遠(yuǎn)足前，他買了很多零嘴。
When/Before/After后面接動(dòng)名詞
Before和After所引導(dǎo)從句，如果主語(yǔ)與主句相同時(shí)，去除從句的主語(yǔ)并將動(dòng)詞改為動(dòng)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(dāng)看電視時(shí)，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(dāng)運(yùn)動(dòng)時(shí)，我喜歡穿運(yùn)動(dòng)鞋。
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