what用法初中

1.What is the main objective of this project?这个项目的主要目标是什么？

2.What time did you get here?你什么时候到达这儿的？

3.What in the world did they think they were doing?他们到底认为自己在做什么？

4.What's the time, by the way?顺便问一句，几点钟了？。