sam（do）his homework every day

sam（do）his homework every day
sam（do）his homework every day

sam（do）his homework every day
does

does
学习是一件愉快的事！ (*^__^*)
请及时采纳，多谢！

does
一般现在时,主语三单
~~~~~~~~~~～～~~~~祝你进步，如对你有帮助，请及时采纳~~~~~~~~~~~~~~~~

does~
要用第三人称单数。

does,第三人称单数