YOU SAID:

i think that bananas should be purple

INTO JAPANESE

私はバナナが紫であることだと思う

BACK INTO ENGLISH

I think that the banana is a purple

INTO JAPANESE

バナナは紫だと思う

BACK INTO ENGLISH

I think bananas are purple

INTO JAPANESE

バナナは紫と思う

BACK INTO ENGLISH

Think purple banana

INTO JAPANESE

紫色のバナナだと思う

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Think of the purple banana

INTO JAPANESE

紫色のバナナのだと思う

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I think the purple banana

INTO JAPANESE

紫色のバナナと思う

BACK INTO ENGLISH

I think the purple banana