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just now的意思是“剛才”,所以是過去時

just意思是剛剛好,舉個例句吧

I have just finished my homework

意思就是我剛剛完成我的作業

just then 就在那時

Just then the meaning of what had been said burst upon him.

就在那個時候,他突然領悟到剛才那番話的含意.

It was just then that he heared the cry in the grass.

就在這個時候,他聽到了草叢裡的叫聲.

just now

1）如果用於過去式,意為“剛才”；

I saw him just now.

我剛才見過他.

The foreign guests arrived just now.

外賓剛到.

2）如果用於現在時,表示“now”的強調,意為“現在,此刻”；

I am busy just now.

我此刻很忙.（此句比I am busy now的語氣強）