No, it is more appropriate to say "communicate in sign language" as sign language is a visual-gestural language and not spoken.
In American Sign Language, you can sign "WHEN YOU BORN?" to ask someone when they were born.
To sign "Are you happy?" in American Sign Language, you would sign: YOU HAPPY? with raised eyebrows.
You sign it.
In American Sign Language (ASL), you can sign "I can understand" by signing I-KNOW, UNDERSTAND.
In American Sign Language (ASL), you can sign "I know" by pointing to your head with your index finger.
Naomi in Hawaiian is written as Nāomi.
A sign language teacher is commonly referred to as a "sign language instructor" or "ASL (American Sign Language) teacher."
You can't really say it, can you?
To sign "Are you mad at me?" in American Sign Language, you would sign: "YOU MAD ME?" while raising your eyebrows and looking concerned.
In American Sign Language (ASL), you can sign "emo" by fingerspelling the letters E-M-O.
To say "twilight" in American Sign Language (ASL), you can sign "night + light" to represent the fading light at the end of the day.