教练指导孩子们如何正确游泳。

The coach ___instructs the kids on how to swim properly.

老师指示学生们在下课前完成练习。

The teacher ___instructed the students to finish the exercises before class ended.

老师指导学生们如何正确操作实验设备。

The teacher ___instructed the students on how to operate the lab equipment properly.