You ( ) ( ) ( ) sports shoes ( ) a trip.去旅游一定要穿运动鞋。

问题描述：

急，讲理由，说清楚

问题解答：

have to wear (have to do 必须做某事）
for（表示目的）

You have to wear sports shoes for a trip.
You ought to wear sports shoes for a trip.

穿鞋 wear shoes
have to 表示 【必须,不得不】
ought to 也可以，表示【应当】
for 表示目的
have to/ought to do sth

You have to wear sports shoes for a trip.

have to: 必须，一定
wear：穿
have to do sth: 一定要做某事
for：此处表示目的

have to wear
on

have to 不得不,一定,须要
wear shoes 穿鞋
on a trip 外出旅游

You'd better wear sports shoes for a trip.