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Prepositions in Noun Clauses
A question word often connects statements containing the verbs know, understand, wonder, ask, and tell with a noun clause (subject + verb combination).
introduction + question word + noun clause
I know
I don't know
Do you know who he is.(?)
I understand
I wonder
Ask him
Tell us
Basic Patterns for Prepositions in Noun Clauses:
A. CLAUSES WITH BE
introduction + question + noun clause
word subject + verb + preposition
I know who(m) the letter is to.
I know what the letter is about.
I know where the letter is from.
I know what state the letter is from.
I know which state the letter is from.
B. CLAUSES WITH OTHER VERBS
introduction + question + noun clause
word subject + verb (object) + preposition
I know who(m) she writes letters to.
I know what she asks for.
I know where she writes from.
I know what state she writes from.