4.Sounds like you’re having a good time.
5.Could you just tell him to call me back?
6. She is working here and I'm going to summer school.
7. 一How's the weather?
—It's cloudy. /It's sunny. /It's rainy.
8.He’s studying at his friend’s home.
9.I’m having a great time visiting my aunt in Canada.
10.The weather here is cool and cloudy,just right for walking.
11. I'm studying English and I'm learning a lot.
12. How’s your summer vacation going?