The sentence is perfectly fine, except headstrong is one word. ) I do not quite understand your second question. But a verb can come in various places in a sentence.
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Adia Khancan we use "to be" with had.The verb phrase "have to + verb" means "must + verb" Unlike "must," a modal verb which is not inflected, "have to" can be in any tense, such as past, future, etc.