为什么英语里数字相加动词用单数,如 one and one is two.

one hour and a half谓语动词为什么用单数? one and one is two 如one or two students 做主语,谓语动词是用单数还复数? one and a half years 谓语动词用单数还是复数?one year and a a day or two,one or two days 后面的动词分别用单数还是复数? 请问 英语 one from two is one 英语数字顺口溜是数字的!如“one,two,three,go!”或“one,two,three,four,go to t 英语!填be动词 One and two () three.把下面句子改为疑问句,肯定,否定回答.This is my one or two 加时间,谓语用单数还是复数?如：one or two hours （ ）enough. "one and a half bananas"谓语为什么用单数? one or two 做主语事谓语动词用单数还是复数 one or two 加名词复数,谓语动词用单数还是复数