教练正在指导孩子们如何正确游泳。

The coach is ___instructing the children on how to swim properly.

教练正在指导球员们如何执行新的战术。

The coach is ___instructing the players on how to execute the new strategy.

老师正在指导学生如何进行实验。

The teacher is ___instructing the students on how to conduct the experiment.