every a and every b ---obey the rulesa had to b have to c has to d must have to

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every a and every b ---obey the rulesa had to b have to c has to d must have to

every a and every b ---obey the rulesa had to b have to c has to d must have to
every a and every b ---obey the rules
a had to
b have to
c has to
d must have to

every a and every b ---obey the rulesa had to b have to c has to d must have to
句子的意思是:每个A和每个B都必须遵守规则.
B,因为 这里用的是“and”,虽然every 后面应该叫的是动词的单数,但是用了and就该用复数,如果句子是用“or”,即every a or every b ,那就应该用C.
must与have to重复,have to已经是必须的意思.must也是必须的意思.
至于A,had是表示过去时,按句子的意思应该是每个a和每个b都应该遵守规则,这个遵守规则应该是一直都要遵守,是一般事态,而不是过去要遵守,现在就不要遵守了.

b

C
And连接几个单数主语,主语由each、 every、 no、 many等词修饰的时候,谓
语动词要用单数
Each boy and each girl is invited.
Every boy and girl is invited.
No boy and no girl is there now.
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