Answer:
he be yxtxtvngjtoghhr. t yvgnkgigjv
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.
1. Si es la calculadora de Adela
2. Si es su clase de español
3. Si son los papeles de la profesora
4. Si es de ella
5. Si es mi novia
6. Si son los lápices de nosotros