写作业的英语是 do homework。其中，“do”是动词，表示“做”或“干”；“homework”是名词，意为“家庭作业”。所以，当你想要表达“写作业”这个意思时，你可以说“do homework”。例如：

1. I need to do my homework before I can go out.

2. She always does her homework at the same time every day.