what he said is true what 又做said宾语?

what he said is true what 又做said宾语? Is what he said really true? what he said is----- Let us s_________ what he said is true. It is true what he said at the meeting what he said is ——- （probable） true O__,what you said is not true. I know what you said is true. -----------（实际上),what she said is not true I think what you said is true what mary said is ____(possible )true . "What the doctor said is true".