The five boys help （ ）（ ） （ 互相）.
each other或one another
另外这两个可作同义句替换
We （ are）（ sure ）（ of ）（有把握 ）winning the game.
are certain about
be sure of
be certain about都是有把握的意思
The five boys help each other.
each other表示互相
例句，比如，We talk to each other very often.我们经常交谈
We are confident in winning the game.
be confident in表示对某事有信心，由於in是介词，后面动词用Ing形式。
例句，I am confident in you.我对你有信心。
each other
are sure of /are certain about
each other
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