我正好跟你相反，我比较怕热。

Wǒ zhènghǎo gēn nǐ xiāngfǎn, wǒ bǐjiào pà rè.

I'm the opposite with you, I don't like the heat.

我跟你的意见完全相反。

Wǒ gēn nǐde yìjiàn wánquán xiāngfǎn.

My opinion is the complete opposite of yours.

我们好像在往相反方向走。

Wǒmen hǎoxiàng zài wǎng xiāngfǎn fāngxiàng zǒu.

We seem to be going in the opposite direction.