when

From Longman Dictionary of Contemporary Englishwhenwhen /wen/ S1 W1 adverb, conjunction, pronoun 1 at what time When are we leaving? When did you first meet Dr Darnall? When will the work be finished? I don’t know when I’ll see her again.when to do something I’ll tell you when to stop.2 at or during the time that something happens Leonard was nine when his father died. When the family came here from Russia, they were penniless. When he was in the air force he flew Tornado jets. 3 after or as soon as something happens When the meal was finished, Rachel washed up and made coffee. I’ll phone you again when I get home.4 used to mention a type of event or situation when talking about what happens on occasions of that type When lead is added to petrol, it improves the car’s performance. When mixed with water the powder forms a smooth paste. He always wears glasses except when playing football. 5 used to show which particular time or occasion you are talking about The best moment was when he scored the winning goal. There are times when I hate him.the day/time/afternoon etc when She remembered the day when Paula had first arrived. 6 → by/since when7 → since when ...?8 DESPITEeven though something is true Why does she steal things when she could easily afford to buy them?9 used to introduce a fact or statement that makes something seem surprising When you consider that the airline handled 80 million passengers last year, the accident figures are really very small.THESAURUSwhen at or during the time that something happensCall me when you get home.When I got here, the place was empty.while during the time that something is happening – used to emphasize that something is continuingI’ll make the salad while you set the table.While we were on holiday, our house was burgled.whenever used in order to emphasize that something always happens when another thing happensHe visits his mother whenever he can.You can come and talk to me whenever you have a problem.by the time used in order to say that one thing has or will have already happened when something else happensBy the time a child is five, he will have watched hundreds of hours of television.GRAMMAR: Choosing the right tense• You use the present tense with when: What are you planning to do when you leave college? • Don’t use ‘will’ in the clause after when. ✗Don’t say: What are you planning to do when you will leave college?• You can also use the present perfect tense with when: What are you planning to do when your course has finished?• When talking about the past, you can use the past perfect tense with when: When the rain had stopped, they went outside. Examples from the Corpuswhen• When are you going to the store?• When did she notice it was missing?the day/time/afternoon etc when• Super Star Video's tapes have all been packed up, waiting for the day when he finds a new location.• Khrushchev may have been perspicacious enough to imagine the day when his turn would come and he would become Special Pensioner Khrushchev.• And then there are the times when I say nothing.• It is better to abolish serfdom from above than to await the day when it will begin to abolish itself from below.• Most of the time when markets move, no one has any idea why.• She lived for the day when she could crunch numbers in the dry air of West Texas.• This comment was made in the early 1980s, around the time when sociolinguistic methods were undergoing some changes.• The name originated from the days when this house belonged to the local policeman.Origin when Old English hwanne, hwenne

单词	when
释义	when From Longman Dictionary of Contemporary Englishwhenwhen /wen/ ●●● S1 W1 adverb, conjunction, pronoun 1 at what time When are we leaving? When did you first meet Dr Darnall? When will the work be finished? I don’t know when I’ll see her again.when to do something I’ll tell you when to stop.2 at or during the time that something happens Leonard was nine when his father died. When the family came here from Russia, they were penniless. When he was in the air force he flew Tornado jets. 3 after or as soon as something happens When the meal was finished, Rachel washed up and made coffee. I’ll phone you again when I get home.4 used to mention a type of event or situation when talking about what happens on occasions of that type When lead is added to petrol, it improves the car’s performance. When mixed with water the powder forms a smooth paste. He always wears glasses except when playing football. 5 used to show which particular time or occasion you are talking about The best moment was when he scored the winning goal. There are times when I hate him.the day/time/afternoon etc when She remembered the day when Paula had first arrived. 6 → by/since when7 → since when ...?8 DESPITEeven though something is true Why does she steal things when she could easily afford to buy them?9 used to introduce a fact or statement that makes something seem surprising When you consider that the airline handled 80 million passengers last year, the accident figures are really very small.THESAURUSwhen at or during the time that something happensCall me when you get home.When I got here, the place was empty.while during the time that something is happening – used to emphasize that something is continuingI’ll make the salad while you set the table.While we were on holiday, our house was burgled.whenever used in order to emphasize that something always happens when another thing happensHe visits his mother whenever he can.You can come and talk to me whenever you have a problem.by the time used in order to say that one thing has or will have already happened when something else happensBy the time a child is five, he will have watched hundreds of hours of television.GRAMMAR: Choosing the right tense• You use the present tense with when: What are you planning to do when you leave college? • Don’t use ‘will’ in the clause after when. ✗Don’t say: What are you planning to do when you will leave college?• You can also use the present perfect tense with when: What are you planning to do when your course has finished?• When talking about the past, you can use the past perfect tense with when: When the rain had stopped, they went outside. Examples from the Corpuswhen• When are you going to the store?• When did she notice it was missing?the day/time/afternoon etc when• Super Star Video's tapes have all been packed up, waiting for the day when he finds a new location.• Khrushchev may have been perspicacious enough to imagine the day when his turn would come and he would become Special Pensioner Khrushchev.• And then there are the times when I say nothing.• It is better to abolish serfdom from above than to await the day when it will begin to abolish itself from below.• Most of the time when markets move, no one has any idea why.• She lived for the day when she could crunch numbers in the dry air of West Texas.• This comment was made in the early 1980s, around the time when sociolinguistic methods were undergoing some changes.• The name originated from the days when this house belonged to the local policeman.Origin when Old English hwanne, hwenne
随便看	take take take (a) hold take (holy) orders take (somebody) ages/forever take (somebody) something (to do something) take (to) the floor take a (long) hard look at something/somebody take a back seat take a back seat take a back seat (to somebody/something) take a back seat to take a bath take a bath take a be given a hammering take a beating take a beating take a bend etc take a bend/fence/corner etc take a bit of doing etc take a bit of doing/explaining etc take a bit of explaining etc take a bite take a bite of of take a bite of out of