just now 有三種含義：
1、at this moment 此時(shí)、此刻、眼下
Come and see me later, I'm busy just now! 過(guò)些時(shí)候再來(lái)，我這會(huì)兒正忙著呢！
2、during this present period 目前；現(xiàn)階段
Business is good just mow. 目前生意很紅火。
3、onlu a short time ago 剛才；剛剛；一會(huì)兒前
I saw her just now. 我剛剛見到過(guò)她。
注：just一般不用于否定形式！