Question

he is 、is not、are not、it is、what is 、that is、we are、she is、t

Answer 1

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