be动词是动词吗
回答如下：
be动词属于谓语动词其中一种
谓语动词包含4种
【1】行为动词：write, say, speak, run
【2】系动词：am,is,are,was,were,
【3】情态动词：can,could,must,may
【4】助动词：be,do,did,will,have,would
be既是系动词也是助动词；系动词be 和助动词be统称为be动词
就像动名词（doing)和动词现在分词(doing)统称为动词-ing一样，
【1】系动词be用法。(am,is,are;was;were;been)
She is a teacher.
She was a student three years ago.
【2】助动词be用法：
She is watching TV in the room.
She was watching doing her homework at this time yesterday.
英语中助动词归纳如下：
(1) am, is, are , was , were,（帮助变进行时态，帮助变被动语态）
(2) do , does, did （帮助句子变疑问句，否定句，强调谓语动词作用）
(3)has ,have （帮助句子变现在完成时态作用）
(4) had ,（帮助句子变过去完成时态，以及虚拟语气倒装）
(5) will , shall （帮助句子变一般将来时态）
(6) would , should （帮助句子变过去将来时态）
(7) be going to（帮助句子变一般将来时态）