Dose he like(要不要加s)play the piano

he teaches us play the piano这个play要不要加ing Can John ( )(play) the piano. play要加s吗 He likes playing the piano."playing”是现在进行时,那么“like”为什么要加s? play the piano为什么不加s Play the druns为什么加s?而Play the piano不加? He can play the piano. he practices playing the piano every daay为什么play要加ing而 I see he practices playing the piano every daay为什么play要加ing 人名(单数)后的一般动词S要不要加 例句Tom like the girl like要不要加s? play flute要不要加the play Erhu要不要加the I WOULD LIKE——PLAY THE GUITAR 空格内要不要加TO like后面要不要加s