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