Every boy and every girl ___ to school in the morning every day. (A)walk (B)walks 答案是B，但是為何不能選A呢？前面主詞不算是複數嗎？

# How is everybody? 大家都怎麼了?
# Everybody has a way of their own. 每個人都有自己的方式。
# Every boy and every girl walks to school in the morning every day. 每個男孩和女孩(每個孩子 = every child)每天清晨走到學校。
# Every man and woman knows the fact. 男人和女人(每個大人= every adult )都知道的事實。（◆縱然「every +名詞」有兩個(以上)也使用『第三人稱單數名詞』。

---When a 1st and 3rd person interpretation of a verb of an unambiguous person feature (present tense verb) with an inclination to the last part noun(=girl) to be followed.Here it involoves verb form sounds much easier and better and simplier=(B) walks.
eg:-Every boy and every girl B walks-----------
Not treated as a compound subject. for two units which will be treated as 3rd person singular.(=B walks)

是