For and since

Universidad del Claustro de Sor Juana
Colegio de comunicación
Fernando Guerrero Lozano
Inglés
Grupo: 8ºB

For & Since with Present Perfect Tense.

We use the present perfect to say how longsomething has continued up to now, we can say this with 'since' or 'for'. This two adverbs are often use when talking about time.

-We use since when we give the beginning of the time.(forexample:since Wednesday)

-We use for when we give the length of the time.(for example:for two days).

for + period
A period is a duration of time, for example: 5 minutes, 2 weeks, 6 years. For means"from the beginning of the period until the end of the period." For can be used with all tenses.

since + point
A point is a precise moment in time, for example: 9 o'clock, 1st January, Monday. Sincemeans "from a point in the past until now." Since is normally used with perfect tenses.

FOR
“for”
a period
(from start to end)
>===< |
for 20 minutes
for three days
for 6 months
for 4years
for 2 centuries
for a long time
for ever
etc |
all tenses |

“For” can be used with all tenses. Here are a few examples:
* They study for two hours every day.
* They arestudying for three hours today.
* He has lived in Bangkok for a long time.
* He has been living in Paris for three months.
* I worked at that bank for five years.
* Will the universecontinue for ever?
For is NOT used with "all day", "all the time" etc.
* I was there all day. (not *for all day

SINCE

since
a point
(up to now)
x===>| |
since 9am
since Monday
sinceJanuary
since 1997
since 1500
since I left school
since the beginning of time
etc |
perfect tenses only |

Since is normally used with perfect tenses:
* He has been here since 9am.
* Hehas been working since he arrived.
* I had lived in New York since my childhood.
Since can also be used in the structure "It is [period] since...":
* It is a year since I saw her.
*...