tchèque Englisch:

I'm learning Czech.

I want to buy a Czech sweater.

I'm a foreigner and I don't know Czech very well. Please, speak slowly.

I am Czech.

the Czech Republic

He's Czech.

Helena Vondráčková is Czech.

Such languages as Russian, Polish, Czech and Bulgarian have common Slavic roots.

Where did you learn Czech so well?

Excuse me, I'm a foreigner and I don't understand Czech all that well.

The professor teaches Czech.