coach複數為什麼加es

coach是以ch結尾的，所以要加es，例如：

1、The two rival coaches got together after the game to compare notes.比賽後，雙方教練聚在一起交換看法。

2、Parents of advanced-math students and Math Counts coaches say the children are on the website constantly.學習高等數學的學生家長和Math Counts的教練們説孩子們經常在線學習研討。

3、He coaches basketball and soccer.他執教籃球和足球。