我对这件事情完全没有印象。

Wǒ duì zhè jiàn shìqing wánquán méiyǒu yìnxiàng.

This thing left no impression on me.

我有印象我来过这里。

Wǒ yǒu yìnxiàng wǒ láiguò zhèlǐ.

I have the impression I've come here before.

我们上次在北京见过面的，你有印象吗？

Wǒmen shàng cì zài Běijīng jiànguò miàn de, nǐ yǒu yìnxiàng ma?

We met in Beijing last time, did it leave any impression with you?