YOU SAID:

If he did he thing why does he think that thing can he done?

INTO JAPANESE

もし彼が何かをしたのなら、なぜ彼はそのことが自分にできると思うのだろう?

BACK INTO ENGLISH

If he did something, why would he think he could do that?

INTO JAPANESE

もし彼が何かをしたのなら、なぜ彼はそれができると思うのでしょうか?

BACK INTO ENGLISH

If he did something, why would he think he could do it?

INTO JAPANESE

もし彼が何かをしたのなら、なぜ彼は自分にそれができると思うのでしょう?

BACK INTO ENGLISH

If he did something, why would he think he could do it to himself?

INTO JAPANESE

もし彼が何かをしたのなら、なぜ彼は自分にそれができると思うのでしょうか?

BACK INTO ENGLISH

If he did something, why would he think he could do it?

INTO JAPANESE

もし彼が何かをしたのなら、なぜ彼は自分にそれができると思うのでしょう?

BACK INTO ENGLISH

If he did something, why would he think he could do it to himself?

INTO JAPANESE

もし彼が何かをしたのなら、なぜ彼は自分にそれができると思うのでしょうか?