Question

complete os espaços com since ou for a) he has been back two hours b) I haven't Seen him Christmas c) you've been watching TV you came home from school d) carol has been looking after the baby over four hours e) the healers have had dusty Their old dog f) we've been standing here twenty - Five minutes

Answer 1

a) for
b)since
c) since
d) for
e)since
f)for 
                                             :)

Answer 2

Using the present perfect, we can define a period of time before now by considering its duration, with for + a period of time, or by considering its starting point, with since + a point in time. FOR and SINCE can also both be used with the past perfect. SINCE can only be used with perfect tenses. FOR can also be used with the simple past.

FOR + A PERIOD OF TIME

for six years, for a week, for a month, for hours, for two hours
I have worked here for five years.

SINCE + A POINT IN TIME

since this morning, since last week, since yesterday
since I was a child, since Wednesday, since 2 o'clock
I have worked here since 1990.


ANSWERS:

A. He has been back for two hours

B. I haven’t seen him since Christmas

C. You have been watching TV since you came home from school

D. Carol has been looking after the baby for over four hours

E. The healers have had dusty since their old dog

F. We’ve been standing here for twenty-five minutes