1. 用作名词，表示“符号”“标牌”“手势”“迹象”等均为可数名词。如：
We hung a sign on the door. 我们在门上挂了一个招牌。
He gave me a sign to leave the room. 他示意我离开房间。
There are signs of sales increasing. 有迹象表明销售额在增长。
2. 用作动词，表示“打手势”，可用作及物或不及物动词。比较以下同义句型：
警察打手势(示意)叫我停下。
正：The policeman signed me to stop.
正：The policeman signed to [for] me to stop.
另外还可以表示“签(名)”或“在……上签字”，也可以是及物或不及物动词。比较：
你在支票上签名了吗?
正：Have you signed (your name on) the cheque?
正：Have you signed (your name to) the cheque?
正：Have you signed (on) the cheque?
误：Have you signed your name in the cheque?
误：Have you signed in the cheque?
注：表示“签名”时，sign 只用作动词，不用作名词。其相应的名词为signature。如：
The document bore his signature. 这份文件有他的签字。
We need signatures and we haven’t got enough of them. 我们需要签名，而现在得到的还不够。
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