YOU SAID:

I'm beginning to think his mind is no longer in mint condition.

INTO JAPANESE

私は彼の心がもはやミントの状態ではないと思うようになり始めています。

BACK INTO ENGLISH

I am beginning to think that his mind is no longer in mint condition.

INTO JAPANESE

私は彼の心がもはやミントの状態ではないと考え始めている。

BACK INTO ENGLISH

I am beginning to think that his mind is no longer in mint condition.