But even when "they" is used as a singular pronoun, its verb conjugation doesn't change from its plural variant. It's still "they are", even when singular.
Notice “skate” versus “skates” in these cases:
- Alice skates; Alice is a skater.
- Alice and Bob skate; Alice and Bob are skaters.
- She skates; she is a skater.
- You skate; you are a skater.
- You skate; you are skaters.
- They skate; they are a skater.
- They skate; they are skaters.