在英语中，“是”（be)是一个系动词，根据主语的不同，be动词形式也不同，am(主语为I)，is(主语为she/he/it)，are(主语为we/you/they)。
例：
I am a teacher.
She/He is an engineer.
It's 8 o'clock now.
We are going to the library. Are you going with us?
They are going to play tennis this weekend.
是的第三人称单数是is
be
v.有存在位于在(某处)(在某时或某地)发生
aux.与过去分词连用构成被动语态与现在分词连用构成进行时
第三人称单数： is
现在分词： being
过去式： was were
过去分词： been 扩展资料
This is the one major drawback of the new system.
