It looks like you’re new here.

看来你是新来的。

It looks like you don’t know what happened.

看起来你不知道发生了什么。

Perhaps she knows the answer.

也许她知道答案。

If I had to take a guess, I’d say he’s 40.

如果要我猜的话，我猜他40岁了。

Maybe he wants to quit his job.

也许他想辞职。

It’s difficult to say, but I think this is the best English course.

这很难说，但我认为这是最好的英语课程。