Mr Green,together with his son ,was supper at 6 o'clock yesterday evening.这里为什么用was 而不是用were?

This is Mr Green ( ) mr green very busy Welcome( )China,Mr.Green Are you Mr Green? W____to Beijing,Mr Green. mr.green is mrs.green is （ ） This is Mr Green's room.Mr green's画线 My English teacher is Mr Green.对Mr Green提问 Mr Jim Green和Mr Green 有什么区别? I called Mr.Green yesterday(对Mr.Green提问) Mr Green,together with his son ,was supper at 6 o'clock yesterday evening.这里为什么用was 而不是用were? MR GREEN TEACHES OUR ENGLISH What does Mr.Green do? She told me____her teacher.A Mr Green isB that Mr Green is C if Mr Green wasD Mr Green was Mr Green teaches_English this term. She told me her teacher.A.Mr.Green isB.that Mr.Green isC.if Mr.Green wasD.Mr.Green was Is mr green your u_____? 什么!Are you Mr.Green?