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Change both into neither in a negative sentence and use a positive verb.
We use the double genitive (of + name + 's, his, mine etc) when we want to emphasise the person who possesses rather than the thing which he possesses. A friend of his is simply another way of saying one of his friends.
Use the question phrase isn't it only when the preceding statement contains the word is: It is a hot day, isn't it?
In this form of question, use the same tense and person as in the preceding statement and use the correct auxiliary. If, however, the preceding statement is in the negative form, the question phrase omits not. We say:
1. They are on holiday, aren't they?
They aren't on holiday, are they?
2. You speak English, don't you?
You don't speak French; do you?
Don't mix one form of the verb with another. If the first verb in a comparison is in the infinitive, the second must also be in the infinitive.