Many thanks!"Untrustworthy" is usually applied to a person, not a statement. I would say "I know that what you said was untrue."
No, it's not possible; that's not a grammatical construction. "That" would need to come earlier in the sentence:I want to say, "I know what you said and that (what you said) was untrustworthy."
Is this a possible construction?
So it becomes "I know what you said that was untrustworthy"?
This was what I could not think of. Thanks!I know what you said and that it was untrustworthy.
Thanks for focusing on my point. This was not from my thinking in the first place. Someone else wondered if what-clause could be modified by adjectival components(that-clause) as a normal noun could. (because we are taught that what-clause is a nominal clause) And I suspected it could.'What you said' may be modified by your that-clause (that was untrue) but it sounds a bit awkward to me.