In the first sentence the subject is "urban sprawl" and the rest of the sentence is the predicate. In the second sentence, the subject is "Growing families" and the rest of the sentence is the predicate.
The subject of a sentence is the term that suffers or provokes the action of the verb of the sentence, while the predicate is all the terms that deny or affirm something about the subject.
In this case, it is important that you know which term is the verb of each sentence, as this term is essential for the subject to be found.
The verb is the term that indicates an action, or a state of the individual. In the two sentences presented above, the verbs are "to harm" and "to want."
Knowing which term is the verb of the sentence, you can find the subject and predicate as follows:
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