Learning English

Correct the mistakes:-
(1) When I was young, I used to ate a lot of sweets.
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(2) I had to left the university, to look after my father.
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(3) I have been play chess for six years.
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(4) If I had I a plane, I'll visit many countries.
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(5) I don't like coffee too.
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(6) Did you use to be naughty, when you was young?
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(7) They are going to fly to France with plane.
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(8) He is cold "The father of computer."
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(9) The blue whale is the long sea animal in the world.
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(10) Who's book is that? It's mine?
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