1.Does词性:does是助动词do的在一般现在时中第三人称单数形式。
2.Is词性:is是系动词,后面加形容词或名词,用于一般现在时。
She doesn't work here, does she?
她不在此地工作,对吧?
Does he know to come here first?
他知道要先到这儿来吗?
How much does it cost to become a member?
要成为会员得花多少钱?
The first stage in research is data collection.
研究工作的第一步是收集资料。
The fact is, they're there to make money.
真实的情况是,他们去那儿是为了赚钱。
Now is a good time to buy a house.
现在买房子正是时候。