I always forget do my homework.错在哪儿?并把答案写出来

forget to do sth.。所以forget 后面加上to就行了！！这是固定词组。

I always forget to do my homework

I always forget to do my homework.

I always forget to do my homework.忘记做做作业。
I always forget doing my homework.忘记了，作业做好了。