There were 6 apples on the table this morning but they are all gone now.
1) I had 16 As on my report card this semester.
「今学期の成績表にAが16個あった。」
2) There were 6 apples on the table this morning but they are all gone now.
「今朝テーブルの上にりんごが6個あったのに全部なくなってる。」
このように、I had ◯ 〜 や There were ◯ 〜 を使って「〜が◯個あった」を表現できます。
ご参考になれば幸いです!