Is it a certain type of wh- clause that ends in a verb?
- I know how tall he is.
- This shows what a disaster it was.
That has this order of Pred-S-Cop?
Is it a certain type of wh- clause that ends in a verb?
That has this order of Pred-S-Cop?
"I know how tall he is." "This shows what a disaster it was."
In these sentences the clauses "...how tall he is", and "...what a disaster it was" are subordinate noun clauses. The noun clauses can act the functions of a noun. Here they are the direct objects of the verbs 'know' and 'shows' respectively.
Subordinate clauses are dependent clauses and they are attached to a main clause by relative pronouns or subordinate conjunctions such as 'who, that, which, how, whatever, whoever, etc.
To know more about the Noun Clauses, please read here: grammarly.com
These sentences contain a subordinate interrogative clause and a subordinate exclamative clause, respectively. Neither construction undergoes subject-auxiliary inversion, but the wh-word (or rather the interrogative/exclamative phrase enclosing it) gets moved to the start of the clause.