YOU SAID:

There was an old lady who swallowed a fly. I don't know why she swallowed a fly perhaps she'll die.

INTO JAPANESE

ハエを飲み込んだおばあさんがいました。彼女がハエを飲み込んだ理由はわかりません。おそらく彼女は死ぬでしょう。

BACK INTO ENGLISH

There was an old woman who swallowed a fly. I don't know why she swallowed the fly. Perhaps she will die.

INTO JAPANESE

ハエを飲み込んだおばあさんがいました。彼女がハエを飲み込んだ理由はわかりません。おそらく彼女は死ぬでしょう。

BACK INTO ENGLISH

There was an old woman who swallowed a fly. I don't know why she swallowed the fly. Perhaps she will die.