Yeah, I'm actually really worried about him.實際上我真的很擔心他

worry about擔心； 煩惱

It doesn't signify, so you needn't worry about it.

這無所謂，你不必擔心。

I wouldn't worry about it, if I were you.

如果我是你，我就不會擔心。

He said, "it's hard to focus on the game他說 ，很難將注意力集中在比賽上

focus on集中在

Our policy is to focus on developing these areas.

我們的政策是著眼于把這些地區發展起來。

The noise made it hard for me to focus on work.

噪音讓我無法集中注意力工作。

when your own teammates are playing against you."當你的隊友們都在對付你"

play against與 ... 比賽

Who did you play against last week?

上星期你們同誰比賽的?

Which team did they play against this time.

這次他們的對手是誰。