吾該幫我用'flu'作一句句子!!急牙help!!!!

I was too weak from the flu to work.
我因患流行性感冒身體虛弱不能工作。

I am flu so I disuse go to school.

Hello, suggestions for your reference as below.

1) I got a flu after my return from China last week.
2) Flu is the most popular disease during the peak season from Mar to Apr in Hong Kong.
3) Peter just suffered from flu two days ago.

Thank you.