The teacher is explaining him how to ask the way in english.改错

The teacher is explaining【to】 him how to ask the way in english.
或者：
The teacher is 【teaching】 him how to ask the way in english.

She offered to carry the box for her mother.
The boy is afraid to speak in front of people.

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为你解答。
The teacher is explaining (改为telling) him how to ask the way in English. 改错
解释：tell sb how to do，告诉某人怎样做。explain的后面缺少了介词to。

She offered to help carry the box for her mother.
她主动提出帮妈妈搬箱子。

The boy is afraid to speak in front of people.
这个男孩害怕在人们的面前发言。

The teacher is explaining him how to ask the way in english.改错
The teacher is explaining to him how to ask the way in English.

She offered to carry the box for her mother.
她主动提出帮妈妈提箱子。

The boy is afraid to speak in front people.
那个男孩害怕在人们面前说话。

如不明白，请追问。