一般现在时：My homework is finished by me.
一般过去时：My homework was finished by me.
一般将来时：My homework will be finished by me.
现在完成时：My homework has been finished by me.
没有现在过去时只有现在进行时：My homework is being finished by me.
（其实以上的句子不用by me更好,显得更地道,但考虑到是作业……就委曲求全了）