①She's having lunch, but the phone rings.

她正在吃午餐，但是电话响了。

②He's riding his bike, but it starts to rain.

他正在骑自行车，但是开始下雨了。

③She's doing exercise, but it gets too hot.

她正在做运动，但是天变得太热了。

④She's watching TV, but the bell rings.

她正在看电视，但是门铃响了。

⑤He's walking in the park, but it starts to snow.

他正在公园里散步，但是开始下雪了。

⑥He's reading a book, but his sister starts to sing.

他正在看书，但是他妹妹开始唱歌了。