every后加什么名词是复数还是单数

We're open from 8 to 7 every day.

我们每天从早8点至晚7点营业。

Every single time he calls, I'm out.

他每次打电话来我都不在家。

Be reasonable! We can't work late every night.

要讲道理呀！我们不能每天晚上都加班到很晚呀。

We see each other every now and again.

我们偶尔相见。

The same argument does not hold good in every case.

同样的`论点并非在所有的情况下都正确。