沒(méi)有have a flu ，只有have the flu。flu是influenza的縮寫，常與定冠詞the連用，但在英式英語(yǔ)中也常省略the。例如：I got flu and was out of commission for a week.我得了流感，一星期沒(méi)工作。

One of the office girls was down with the flu.

一位女職員得了流感。

Three members of the band went down with flu.

這個(gè)樂(lè)隊(duì)有3名成員得了流感。

The school was closed because of the flu.

因?yàn)榱餍行愿忻叭ＭＶ股险n。

I caught a flu and had to lie in the bed.

我得了流感，不得不臥床休息。