YOU SAID:
i think today's weather is great
INTO JAPANESE
今日の天気は素晴らしいと思う
BACK INTO ENGLISH
i think the weather is great today
INTO JAPANESE
今日はいい天気だと思う
BACK INTO ENGLISH
i think the weather is nice today
INTO JAPANESE
今日はいい天気だと思う
BACK INTO ENGLISH
i think the weather is nice today
That didn't even make that much sense in English.