YOU SAID:

roses are red for half a year

INTO JAPANESE

バラは半年間赤い

BACK INTO ENGLISH

Roses are red for six months.

INTO JAPANESE

バラは半年間赤い。

BACK INTO ENGLISH

Roses have been red for half a year.

INTO JAPANESE

バラは半年前から赤くなっている。

BACK INTO ENGLISH

The rose has been red for six months.

INTO JAPANESE

そのバラは６ヶ月間赤かった。

BACK INTO ENGLISH

The rose was red for six months.

INTO JAPANESE

そのバラは半年間赤かった。

BACK INTO ENGLISH

The rose was red for six months.