My brother后面的be动词接is/was形式。例如,My brother is a middle school student.
My brother was 13 years old last year.
my brother是单数名词,所以谓语动词用单数。
My brother后面的be动词接is/was形式。例如,My brother is a middle school student.
My brother was 13 years old last year.
my brother是单数名词,所以谓语动词用单数。