Answer:

ix. It is a complex sentence as it contains a subordinate clause starting with "I don't know" and a main clause.

Complex sentence: "I don't know the time of his death."

x. "But for your help, I would have been ruined." can be transformed using the "if" clause to form a complex sentence.

Complex sentence: "If it weren't for your help, I would have been ruined."

Explanation:

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Answer:

I don't know the time when he died.

If you had not helped me , I would have been ruined.