These sentences all have a mistake. Correct them.
1. I am writting to ....
1.
2. Last year, I have done some babysitting
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3. Sincerly
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4. Your faithfully
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5. I trust you found me reliable
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6. I want this job for earn pocket money
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7. I am available at Saturdays and Sundays
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8. I look forward to hear from you soon.
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9. I have 16 years old.
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10. I am interesting in this job.
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11. This job seem perfect for me.
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12. I have ever worked as a waitress.
12.