PRESENT PERFECT WORKSHEET, answer key

Exercise 1:

1 since  2 for  3 since  4 for  5 for  6 for  7  since  8 since  9  since   10  for

Exercise 2:

1 have worked  for
2 has been for
3 haven´t studied  since
4 hasn´t painted since
5 hasn´t lived since
6 haven´t played  for
*7 Where have you been since eight o´clock ( cross out At)  
8.- hasn´t been to for
9.- haven´t sold   since
10  haven´t you taken for

Exercise 3:
for, since, for, since for since for for since since since for for, since, since, since