word formation
act: actionat, (in)active, actor
athlete: athletic, athletics
chiid: children, childhood
collect: collection, collector
entertain: entertainment
hero: heroic, heroine
music: musical, musician
play: player, playfull
sail: sailing, sailor
sing: sang , sung, song, singer, singing
Trả lời là cái nào là danh từ, động từ, tính từ,