① I'm so sad not to be with you while you are having a hard time.
② I'm so sorry that I cannot to be with you while you are in a difficult moment.
こんにちは、annaさん
「貴方が一番つらい時にそばにいられなくて悲しいです。」ですね？
① I'm so sad not to be with you while you are having a hard time.
② I'm so sorry that I cannot to be with you while you are in a difficult moment.
こんな感じでいかがでしょうか？
アダム先生＆ミチコ先生
アメリカ合衆国 
