Подскажите по образуйте множественное число .a boy,a man,a foot,a mouse,a rabbit,a clock,an armchair,ahall,a bed.

1. I read different fairy tales in my childhood.
2. I learnt mathematic, english, literature, geography, chemistry, music and many others sudjects in school.
3. I left school two years ago.
4. I became a student last year.
5. I spent my last summer vacation at home.
6. I saw my friend last Monday.
7. I got a dog on my last bithday.
8. I invited  six peaple to my bithday party.
9.  Because It was too small for me.
10. I stayed at my friend's all night long.
11. I payed fifty dollars for the jacket.
12. I saw a cartoon on TV yesterday. 

1. Yesterday she finished work late.
2. When we returned, they had already finished the job.
3. When I called them, they were finished.
4. Tom looked tired, because he had finished the job.
5. You when the work was finished yesterday?
6. He finished this work by 5 o'clock yesterday.
7. He finished the job in 5 hours yesterday.
8. I was doing homework and he had finished his work.
9. Yesterday at 7 o'clock he was still finishing his work.
10. Before they met in the Park, he had finished his work for two hours.