“Which prison officer claimed the prisoners had secretly made keys”is a compound sentence including a declarative clause and an interrogative clause.
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If a group of words can stand alone, they form a constituent.
A. 对
B. 错
WH-movement is obligatory in Englishwhich changes a sentence from affirmative to interrogative.
A. 对
B. 错
Phrase structure rules provide explanations on how syntactic categories are formed and how sentences are generated.
A. 对
B. 错
For the sentence *"I'm not sure which senators has the president spoken to", it is ill-formed because the auxiliary verb "has" is moved to the "C" position of CP which is occupied by the covert complementizer "that".
A. 对
B. 错