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from now on, [clause]
通常放在句首，表示从现在开始采取某种行动。
From now on, I will study harder.
从现在开始，我会更努力地学习。
从现在起；今后
先理解核心含义，再看它在真实句子里的用法。
从现在起；今后
Starting from this moment and continuing indefinitely.
From now on, I will study harder.
从现在开始，我会更努力地学习。
从此刻开始并无限期持续。
Starting from this moment and continuing indefinitely.
From now on, I will exercise every morning.
从现在开始，我每天早上都会锻炼。
From now on, no one is allowed to use phones during class.
从现在开始，课堂上不允许使用手机。
I promise to be more careful from now on.
我保证从现在开始会更加小心。
通常放在句首，表示从现在开始采取某种行动。
From now on, I will study harder.
从现在开始，我会更努力地学习。
也可放在句末，强调时间起点。
I will be more careful from now on.
从现在开始我会更小心。
常与将来时连用，表示决心或计划。
From now on, we are going to save money.
从现在开始，我们要省钱。
Not this
I have studied hard from now on.
Use this
I will study hard from now on.
从今以后表示未来的动作，不能用现在完成时，应使用一般将来时。
Not this
Since now, I won't eat junk food.
Use this
From now on, I won't eat junk food.
表示从现在开始，英语中通常用 'from now on'，而不用 'since now'。
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
Use from now on naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
置于句首时，常用逗号与主句隔开。
Dictionary facts from ECDICT, WIKTIONARY.