a) We are studying English.
b) I am playing football now.
c) She is doing her homework.
d) He is running now.
e) They are swimming in a lake.
f) We are dancing in a party.
(a f é dancing mas as duas opções estão escritas da mesma forma. Talvez você tenha escrito errado, certo?)
Espero ter ajudado! ^-^