YOU SAID:

And if I’m really alone, then I really must go

INTO JAPANESE

私は本当に一人の場合、本当に行かなければなりません

BACK INTO ENGLISH

I for one really really have to go

INTO JAPANESE

私は 1 つは本当に行かなければなりません。

BACK INTO ENGLISH

I have to go to one.

INTO JAPANESE

私はいずれかに行かなければなりません。

BACK INTO ENGLISH

I have to go to one.