is和does的区别是什么?如：when does your brother do his homework?可不可以说

不行,is是be动词,后面只能接名词,形容词,动词不定式to do,ing动词.例如：
he is to study hard .
she is cleaning her room .
does做实义动词是“做”的意思,如,he usually does his does homework afterschool .does做助动词无意义,一般表示强调,he does do the homework.（他真的做了家作） 或在疑问句中与动词原形连用does she do the homework
这应该就是它们的区别,而它们的共同点就是它们都只能用于单数形式,且是现在时.

is既是助动词又是状态系动词
do既是助动词又实义动词
When does your brother do his homework?中does是do作助动词的第三人称单数形式 它帮助实义动词do构成疑问句is只能构成时态和语态的变化

is既是助动词又是状态系动词
do既是助动词又实义动词