To speak French in English, you can say "parler français" or "to speak French." The word "parler" comes from the French verb "parler," which means "to speak," and "français" comes from the French word for "French." Here are a few examples of sentences using "parler français":

Je parle français. (I speak French.)

Tu parles français. (You speak French.)

Il parle français. (He speaks French.)

Elle parle français. (She speaks French.)

Nous parlons français. (We speak French.)

In each of these examples, "parler français" is used to indicate that the subject of the sentence is able to speak the French language.