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For/Since: second step... - English lesson
1) Reminder of the test of introduction to FOR and SINCE :
- FOR is used to express a duration (or length of time);
If FOR is placed on a line representing the passing of Time, it must be a segment; -------------------------|----------|------------> = for a week.
- SINCE is used to express the starting point of an action or to give a precise date:
It is 'a point' on the line of Time ---------X
> = since 2001
2) Once the choice is made between FOR and SINCE, the real difficulty consists in determining the tense and form (simple or in –ing) of the verb.
FOR and SINCE may be connected to the past, and sometimes to the present too.
ex : He has known her for 5 years.
(This sentence shows a length of time=> for ; the action which started in the past – 5 years ago – is going on in the present. It is the assessment of the action of ‘knowing'.=> present perfect.)
for five years
|--------------------------------------->X|---------------->
2010 moment
présent
2015
ex : Her brother hasn't written to her for several months.
The absence of mail started several months ago, and is going on in the present. Once again, it is the assessment of an action => present perfect.
3) If we want to insist on the fact that the action has been lasting for some time and is going on in the present. we have to use the present perfect in –ing, with for or with since :
ex : She's been learning French for 7 years now and speaks quite well !
4) FOR and SINCE can also mention actions happening in the past only. Then, they have no links with the present. :
ex : Last year, he was ill for a whole month.
1 month
--|---------|<----à|-------------------|--------------------------X------------>
he was Last Present
ill year moment.
The action which started in the past, was finished in the past too. In the present, it's 'simply' a memory... The tense you have to use then, is obviously the simple past .
Therefore, you must try to forget the frequent 'summary' consisting in saying:
[**For and Since, are always used with the present perfect]: IT'S WRONG! On the contrary, it's true that they're never used with a present.(simple or in - ing).
Come on, now ! Make sure you have memorized all the important distinctions between the different uses... and GO FOR IT!

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