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5. This is a white mouse. - These are white mice.
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Last year you wore uniform at school. She had no classes outdoors yesterday. They spent four years in primary school. l went to London five times last year. We had Handicraft lessons three times a week last year. l learnt well last year. She left home at seven o'clock yesterday.
1.playing
2. swimming
3. (без to)Drinking milk...
4. ( без to)Learning...
5. skiing
6. interested in travelling
Why do not you have a sister?
why do not you write your homework?
Where are we meeting today?
where is your younger brother?
1 helped
2 had told, would have helped (почему-то такого варианта я у вас не увидела, может просто ошиблись? но именно этот вариант правильный. Это условное предложение 3 типа, нереальное. Переводится так: Если бы вы мне вчера об этом сказали, я бы вам помог)