The progressive form is also used in the past and perfect tenses
EXERCISES
CHALLENGING
Challenging 1
Challenging 2
Challenging 3
Challenging 4
Challenging 5
Challenging 6
Challenging 7
Challenging 8
Challenging 9
Challenging 10
Challenging 11
Challenging 12
Challenging 13
Challenging 14
Challenging 15
Challenging 16
Challenging 17
