How do you say like in French?

The verb "to like" in French is "aimer". It is a regular "-er" verb, meaning that it is conjugated with the typical endings of most "-er" verbs. You would conjugate it:

J'aime
Tu aimes
Il aime
Elle aime
Nous aimons
Vous aimez
Ils aiment
Elles aiment

However, the word "like" used in a comparison to form a simile, such as in the phrase "sunk like a rock" is the word "comme". You would use it exactly the same way you would use the English "like".

"I swim like a fish." = "Je nage comme un poisson."