sign的过去式

sign的过去式是signed。

sign例句有如下：

1.Saying?No is?not?a?sign?of?weakness,?it is an?indication?that?you?know?your?own?strengths?and?are?able?to?prioritise.说“不”并不证明你无能，说“不”可以反映出你知道自己的能力何在而且懂得优先考虑。

2.I?can?sign?a?contract?up?to a?year.?I?don't know?where?I'll?be?after?that.我能签最多长达一年的。我不知道一年后我会在哪里。

3.If?you?often?hear?others?say?the?word?"naive"?,?it's a?dangerous?sign?that your?imagination?is?about?to?leave?you.如果你对别人经常说“幼稚”两个字，这就是你的想象力即将离开你的危险信号。