回答如下：
系动词is属于be动词。系动词be包括am， are， is， was， were。英语系动词be通常后跟作表语的形容词、有些副词、名词、代词、不定式、动名词、分词、表语从句。例如：
He is ill / out / a doctor / injured.
My job is to tend / tending the patient.
The fact is that he broke the vase.
That is where he lives.
This book is interesting.
