Answer:
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subject: our apartment building
main verb: has
subject: many children
main verb: are
subject: my grandmother's kitchen
main verb: smells
subject: the rent in the downtown area
main verb: is
subject: my sister
main verb: is thinking
subject: studying
main verb: is
subject: a website
main verb: is
In the "there is/are... " pattern, the subject comes after the verb is/are, unlike the other pattern.