he is 、is not、are not、it is、what is 、that is、we are、she is、they are、do not?

is, are, do 分别是系动词和助动词,
对应的过去式是was, were,did
所以：
he was、was not、were not、it was、what was
that was、 we were、 she was、they were、did not