transforma de positivo a negativo. ( en inglés)

1) this exercise is diffilcut.
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2)we're from spain.
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3)My grandmother'S name's Adelaide.
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4)thes kids are in the garden.
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5)you're english.
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6) My car is very expensive.
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7) this is my student's notebook.
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8) these photographs are very nice.
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9) Jerry is twenty-five years old.
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10) I'm fine.
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11) He is from Mexico.
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12) You are in this class.
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13) they are inmigrants
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ayuda!!!
AYUDAAAAAA!!!!!!!!​