Question

__tomorrow,he would be able to see the opening ceremony. A,If he comes B,were he to come

为什么A不对？？

Answer 1

1)这是虚拟语气的其中一种
表示对将来情况的主观推测 　　
①if+主语+were to do 主句 ①主语+should/would/could/might+do 　
　②if+主语+did/were ②主语+should/would/could/might+do　 　
　③if+主语+should+do ③主语+should/would/could/might+do　 　　
If he were to come, he would be able to see the opening ceremony.
这里是符合第一种的

2)而if he were to come, 可以表述成were he to come
这是是运用到这点---- 当虚拟条件句的谓语动词含有were,should,had时，if可以省略，这时条件从句要用倒装语序，即把were,should,had等词置于句首，这种多用于书面语。
eg：Should he agree to go there,we would send him there. =If he should agree to go there,we would send him there.　
　
Were she here,she would agree with us. = If she were here,she would agree with us

　Had he learnt about computers,we would have hired him to work here. =If he had learnt about computers,we would have hired him to work here.

所以是选B， 如果要选A，通常是主句用一般将来时的，If he comes tomorrow,he will be able to see the opening ceremony.

Answer 2

选B,省略if的虚拟语气