Names in sign language are generally fingerspelled, unless a d/Deaf person assigns a specific name sign to that person. If a person named Christina received a name sign, that would not be the name sign for all Christinas. A name sign refers to a specific person, not the name itself.
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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.
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.