| 词组 | for since in and from time |
| 释义 | Contents overview for , since , in and from : time469 for, since, in and from: time1forWe use for for duration – to say how long something lasts.for + period of timeI studied the guitar for three years at school.That house has been empty for six months.We go away for three weeks every summer.My boss will be in Italy for the next ten days.To measure duration up to the present, we use a present perfect tense (52.1), not a present tense.I've known her for a long time. (not I know her for a long time.)We've lived here for 20 years. (not We live here for 20 years.)A present tense with for refers to duration into the future. Compare:How long are you here for? (= Until when …?)How long have you been here for? (= Since when …?)We can often leave out for in an informal style, especially with How long …? And for is not usually used before all.How long have you been waiting (for)?We've been here (for) six weeks.I've had a headache all day.2for and since with perfect tenses: the differenceFor and since can both be used with a present perfect to talk about duration up to the present. They are not the same. Compare:for + periodI've known her for three days. (not … since three days.)It's been raining for weeks.since + starting pointI've known her since Tuesday.It's been raining since the beginning of the month.With a past perfect, for and since refer to duration up to a particular past moment.She'd been working there for a long time. (not … since a long time.)She'd been working there since 1988.3in after negatives and superlativesAfter negatives and superlatives, in can be used to talk about duration. This is normal in American English.I haven't seen him for/in months.It was the worst storm for/in ten years.4from and sinceFrom and since give the starting points of actions, events or states: they say when things begin or began.from/since + starting pointI'll be here from three o'clock onwards.I work from nine to five.From now on, I'm going to go running every day.From his earliest childhood he loved music.I've been waiting since six o'clock.I've known her since January.We use since (with a perfect tense) especially when we measure duration from a starting point up to the present, or up to a past time that we are talking about.I've been working since six o'clock, and I'm getting tired. (not I've been working from six o'clock …)I had been working since six o'clock, and I was getting tired.From is used in other cases.The shop was open from eight in the morning, but the boss didn't arrive till ten. (not The shop was open since eight …)I'll be at home from Tuesday morning (on). (not … since Tuesday morning.)From is sometimes possible with a present perfect, especially in expressions that mean 'right from the start'.She's been like that from her childhood. (or … since her childhood.)From/Since the moment they were married, they've quarrelled.From/Since the dawn of civilisation, people have made war.For from … to and from … until, 613.For more about tenses with since, 579.For since meaning 'as' or 'because', 377.Previous Next |
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