• Is it? = just add "ka" to the end of sentence.
• ei.:Kore wa hon desu-ka?

• my,yours etc = just add "no" after pronouns
• ei.:Watashi-no, anata-no etc.
• Kore wa watashi-no hon desu!

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Sentence 3.

• Are you American? = Anata wa Amerika-jin desu ka?
• Is he Japanese? = Kare wa Nippon-jin desu ka?

• That is her car! = Sore wa Kanojo no kuruma desu.
• Is that(over there)his car? = Are wa kare no kuruma desu-ka?