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right now
含义：立刻，马上（强调当前时刻）
例句：I need your help right now.
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just now
含义：刚才（英式英语）；现在（美式口语中有时也指“刚刚”）
例句：She called me just now.
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from now on
含义：从现在起，今后
例句：From now on, I’ll study harder.
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now and then / now and again
含义：偶尔，时不时地
例句：We still meet for coffee now and then.
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now that
含义：既然，由于（引导原因状语从句）
例句：Now that you’re here, let’s start the meeting.
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by now
含义：到目前为止，此时此刻（常用于完成时）
例句：He should have arrived by now.