From then on my world was only black and white.
From now on my world will only be black and white.
用过去时还是将来时根据具体语境决定。from then on 从那以后，从那时起；from now on ,从今以后，从现在开始。
从此我的世界只剩黑白
From now on there is only black and white in my world.
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