I ache all over.

我浑身酸痛。

I'm easy to please.

我很容易相处。

You are just trying to save face.

你只是想挽回面子。

She is sick in bed.

她卧病在床。

He's behind the rest of the class in reading.

他在阅读方面不如班上的其他同学。

If you consider that she's only been studying English a year, she speaks it very well.

你可以考虑到她那学一年的英语，她的英语说得非常好。