The document discusses the use of "since" and "for" in the present perfect tense. Since is used to indicate a starting point in time, such as "since Monday" or "since 2006." For is used to indicate a period or duration of time, like "for two weeks" or "for a decade." Several example sentences are provided that use since and for in the present perfect tense to express when an action began or how long it has been occurring.

1. Since and For
in the Present Perfect Tense

2. Since
Since is used for:
 start of the time
 a particular time
Since Monday
PresentPast
Monday
start of the time

3. Since can be used with ............
April 4th
2001
12:30
I came to
Buffalo
Christmas
last weekend
a month ago
9 o’clock
Since

4. Simple sentences with Since
I have been in the office since 9 o’clock.
I have lived in Buffalo since 2006.
She has known John since December 12th.
We haven’t taken a test since last week.
I have had a driving license since I was 18.
They have taken this class since January.
It hasn’t snowed since two weeks ago.

5. For
For is used for:
 a period of time
 a duration of time
1 2 3 4
For four days
PresentPast

6. For can be used with ………….
two weeks
a month
five years
ten minutes
a decade
ten seconds
a long time
an hour
For

7. Simple Sentences with For
I have waited for my friend for an hour.
I have studied English for a month.
It hasn’t snowed for more than two weeks.
Have you been in Buffalo for a long time?
She has been in Canada for five years.
They haven’t slept for a whole day.
I have talked with my mother for 10
minutes.

8. Let’s compare since with for !
I have had this book _______ March 1st
.
I have had this book _______ two weeks.
I have been in England _______ 2006.
I have been in England_______ half a year.
I have known him _______ a month ago.
I have known him _______ a month.