Maria asked I read which book
This sentence is ungrammatical.
- Is this because an IP
I read
cannot be a complement or sister to a Vasked
- Is there a CP in this ungrammatical sentence?
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Maria asked I read which book
This sentence is ungrammatical.
I read
cannot be a complement or sister to a V asked
The ungrammaticality is not related to the fact that V cannot take IP as complement. This fact is evidenced by (1) and (2) (hence your first question):
(1) She wants [IP to leave]
(2) She wants [IP him to leave]
The ungrammaticality is related to the strong wh-feature [+wh] which is left unchecked. The object which book of read, after assigned a theta-role and a case from this verb, it has to move to check another wh-feature of the complementizer CP (hence, your second question- yes there's a CP):
(3) [IP Maria [VP V asked [CP {+wh} [C ∅ [IP I read [DP which book]]]]]]