1) es , 2) está hopefully it’s right
Tú casa es grande.

The difference between "tú" and "usted" depends on the formality. "Tú" is used <u>when talking to friends or relatives (informal)</u> while "usted" is used <u>when talking to older people or a person of high social rank (formal)</u>.
In this case we want to write the <u>informal</u> form of "tú", so we use "tú". Also, when dealing with <u>permanent states</u>, the verb "ser" (to be) is used.
Answer:
I'm guessing its "necesito"
That means "have to"
so it would be :
Spanish: yo necesito regresar a la casa a las 4:00 de la tarde
English: I have to get home at 4:00
A translation : They are paragraphs that go under the title and refer to the main idea of each of those paragraphs.