He is on his way to the forest to look for a mate.它正准备到森林里寻找配偶

on one's way to去...的路上

I passed the store on my way to the library.

我在去图书馆的路上经过了那家商店。

I ran across Tom on my way to school.

在去学校的路上我碰到了汤姆。

look for寻找；寻求

He turned on the torch to look for his keys.

他打开了手电筒，寻找钥匙。

Whether he gets one or not will depend on his strength...and on the size of his jaws.至于能否如愿要看它的力气和它颚部的大小

whether or not是否

I am deliberating whether or not to buy a new car.

我在考虑是否要买一辆新汽车。

Whether or not he will stay, I really don't care.

他要留下来还是要走，我真的不在意。

depend on依赖；依靠；取决于

We depend on the radio for news.

我们靠收音机听新闻。

Children depend on their parents for food and clothing.

小孩依赖他们的父母供给衣食。