My birthday is September 15.
The date of the event is May 22.
请问这里的 is 系动词还是不及物动词?
My birthday is September 15. = My birthday is on September 15. 这里的 is 不是系动词。(此用法见《朗文高级英语应试词典》英汉双解版p.168的例句:The party is on Saturday. 聚会是在星期六。)
The date of the event is May 22.这里的 is 是系动词。(《朗文高级英语应试词典》认为“表示某人或某物与主语相同”的be动词是连系动词。这里的The date of the event 和 May 22相同)