A:Where are you going?你要去哪里？
B:I'm going to Bill's house.我打算去比尔家。
A:What are you going to do there?你去那里干什么？
B:I'm going to help him.我要去帮他。
A:What's he doing?他在做什么？
B:He's fixing his roof.他在修屋顶。
