Answers of exercises

1.
a. Look, I (have) have two tickets for the circus.
b. Look, I (hold) am holding two tickets for the circus.

2.
a. Sam (sit) was sitting in the seat next to me when the clown threw a bucket of water at me.
b. Sam (be) was in the seat next to me when the clown threw a bucket of water at me.
3.
a. One clown was juggling while he (balance) was balancing a glass of wine on his head.
b. One clown was juggling while he (have) had a glass of wine on his head.

4.
a. Right now, I (see) see two elephants doing tricks in the ring.
b. Right now, I (look) am looking at two elephants doing tricks in the ring.