Thursday, 20 May 2010

for, since, from , ago and before

1. For, since and from 'point forwards' in time
Ago and before 'point backwards' in time.

2. We use for to say how long something lasts

for + period of time

  • I once studied the guitar for three years

  • That house has been empty for six weeks

  • We go away for three weeks every summer.

  • My boss will be in Italy for the next ten days.


When we talk about a period of time up to the present, we use for with the present perfect tense (have+ past participle)

  • I've known her for a long time (NOT I know her...)


A present progressive with for often refers to the future.

  • How long are you staying for? (=Until when)


We can leave out for with How long....?

  • How long are you staying?

  • How long have you been waiting?


3. From and since give the starting point of an action or state: they say when something begins or began.

from/ since + starting point

  • I'll be here from three o'clock onwards.

  • I word  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 ten o'clock.

  • I've known her since January.


Since gives the starting point of actions and states that continue up to the present; from gives the starting point of other actions and states

4. For and since can both be used with the present perfect (have + past participle). They are not the same

for+ period

  • I've known her for three days.

  • I've been here for a month.

  • I've had my car for ages.


since + starting point

  • I've known her since Tuesday.

  • I've been here since July.

  • I've had my car since 1980

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