他辅导学生数学，帮助他们准备考试。

He ___coaches students in math to help them prepare for tests.

她已经指导一支青少年足球队两年了。

She has been ___coaching a youth soccer team for two years.

专家将指导运动员为即将到来的比赛。

The expert will ___coach the athletes for the upcoming competition.