2. I ___________ in the river.
swam
to swim
are swimming
am swiming

3. A : Are they writing now?
   B : “_________________”
Yes, they are.
They are not writing now.
They are reading.
Yes, they do.

4. You______not_________now.
do, work
are, working
have, work
does, work

5. What______the dog_______now?
are, do
do, doing
is, doing
is, do

6. We _________our classroom now.
are cleaning
were cleaning
is clea
are clean

7. She__________milk now.
drink
drinks
is drinking
are drinking

8. Mary and I_________the window.
open
to opens
am opening
are opening