YOU SAID:

I see a red door I must have it painted black

INTO JAPANESE

赤いドアが見えます黒く塗らなければなりません

BACK INTO ENGLISH

You can see the red door must be painted black

INTO JAPANESE

あなたは赤いドアが黒く塗られなければならないのを見ることができます

BACK INTO ENGLISH

You can see the red door must be painted black