YOU SAID:

if humanity doesn't land on mars in my lifetime, I would be very disappointed

INTO JAPANESE

もし私が生きている間に人類が火星に着陸しなかったら、私はとてもがっかりするだろう

BACK INTO ENGLISH

I would be very disappointed if humans don't land on Mars in my lifetime.

INTO JAPANESE

私が生きている間に人類が火星に着陸しなかったら、とてもがっかりするでしょう。

BACK INTO ENGLISH

I would be very disappointed if humans don't land on Mars in my lifetime.