這樣說吧,in與將來一段時(shí)間連用,如i will come back in 2 days,later的用途比較廣泛可用于多種時(shí)態(tài){具體見后文},after跟一段時(shí)間用于過去時(shí),點(diǎn)時(shí)間用于將來時(shí)和現(xiàn)在時(shí)
具體內(nèi)容
later、after、ago、before的用法：
①“一段時(shí)間+later/ago”分別表示“(多久)以后/以前”,主要用于過去時(shí)態(tài).
②“after/before+某個(gè)時(shí)刻”分別表示“在某時(shí)刻之后/之前”,此時(shí)兩個(gè)詞是介詞.
③ago與before：ago只能用于過去時(shí),before用于完成時(shí).
如：He had an accident a weekago.(一周前出了一個(gè)事故).
Some yearslater,the boy became a very famous
singer.(數(shù)年后這個(gè)男孩成了著名的歌唱家).
Have you been therebefore?(你從前到過那兒嗎?).
Aftera few years he gave up
smoking.(過了幾年他戒了煙.)
I.after,in用法辨析
在表示以現(xiàn)在為起點(diǎn)的“在.之后”含義時(shí),in之后應(yīng)接時(shí)間段,after之后應(yīng)接時(shí)間點(diǎn),當(dāng)以某個(gè)過去時(shí)間為起點(diǎn)時(shí),after之后既可接時(shí)間點(diǎn),也可接時(shí)間段.
如：It's three o' clock.I'll be back in an hour.
現(xiàn)在是三點(diǎn),我一小時(shí)后回來.
The manager will come back after seven o' clock.
經(jīng)理七點(diǎn)后回來.
Just after five the rain began to fall.
剛過五點(diǎn)就下起雨來了.
After three days I went to a party.
三天后,我去參加一個(gè)聚會(huì).
II.ago,before用法辨析
ago表示以現(xiàn)在算起的“.以前”,與之連用的謂語動(dòng)詞用一般過去時(shí),before則表示以從某個(gè)過去時(shí)間點(diǎn)算起的“.以前”,與之連用的謂語動(dòng)詞用過去完成時(shí).
如：He lived in Beijing ten years ago.
十年前他住在北京.
He said that he had seen her two days before.
他說他兩天前見過她.
in表示的時(shí)間1.“in+一段時(shí)間”意為“將來一段時(shí)間之內(nèi)/后”.例如:I will return the book in four
days.我會(huì)在四天之內(nèi)歸還這本書的.I'll come and see you again in five
days.過五天我再來看你.2.也可用來表示“過去一段時(shí)間之內(nèi)”.例如:The work was done in a week.這工作一星期內(nèi)就做完了.
after表示的時(shí)間1.after作為介詞,用來表示在某一時(shí)間或某一具體事件以后,與之連用的謂語動(dòng)詞可用過去時(shí),也可用將來時(shí).例如:I went to bed
after ten o'clock last night.我昨晚十點(diǎn)鐘后上床睡覺.They will play football after three
o'clock in the afternoon.他們下午三點(diǎn)以后踢足球.2.after用作從屬連詞時(shí),意為“在……以后”,引導(dǎo)時(shí)間狀語從句.例如:I am
going to see my friends after school is over