#2
1. is studying.
2. aren't going.
3. isn't enjoying.
4. are (you) seeing.
5. are (you) going.
6. are (they) laughing.
7. is having.
8. aren't listening.
#3
1. Mario comes from Italy.
2. We usually go by bus.
3. He speaks Mandarin and Japanese.
4. What a great meal! Everyone's enjoying it.
5. I love coffee ice cream.
6. What are you doing tonight?
#4
1. goes.
2. think.
3. are meeting.
4. are (you) doing.
5. looks.
6. are (you) coming.