be back和come back都可以表示回来的意思。

My mother is back home.

我妈妈回来了（回家里）。

The Spring comes back.

春天又来了。

Take some food for me when you are back.

你回来的时候给我带点吃的。

I'll be back in a little while.

我一会儿就回来。

She'll be back in a week.

她一周后回来。

It was good to be back on dry land again.

回到陆地上真好。

It was good to be back on land.

回到陆地上真好。

The team will be back at full strength for the next match.

这支队在下场比赛将恢复最佳的阵容。