is是动词，用于第三人称单数现在时。例句：He is an asthmatic who is also anaemic. 他是一个哮喘病人，并且还贫血。Eight hours on a bus is no joke,is it. 坐８个小时的公交车可不是闹着玩儿的，对吧。
相关介绍：
He is in no doubt as to what is needed.
他对需要些什么心中有数。
It is a country where corruption is rife.
这是个腐败成风的`国家。
Is he really sick or is he just shamming?
他真病了，还是装的？
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