状のアーオの英文のうち, 文法的に正しいものを 2 つ選び, 記号で答えなさい。
(オ My sister is very good at play the piano.
イ Tremember seeing him at the party, but Thave forgotten his name.
> Our teacher says the classroom must be keep clean.
エ This movie is much more interesting than that one.
オ The children wanted to have some friends to play-