YOU SAID:

I can assure you that my birds both still have their wings.

INTO JAPANESE

私の鳥の両方がまだ彼らの翼を持っていることを私はあなたに保証することができます。

BACK INTO ENGLISH

I can guarantee you that both of my birds still have their wings.

INTO JAPANESE

私の鳥の両方がまだ彼らの翼を持っていることを保証することができます。

BACK INTO ENGLISH

Both of my birds can still guarantee that they have their wings.

INTO JAPANESE

私の両方の鳥はまだ彼らが彼らの翼を持っていることを保証することができます。

BACK INTO ENGLISH

Both of my birds can still guarantee that they have their wings.