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Ответ:

a) 1)my sister tidied her room yesterday

2) my sister didn't tidy her room yesterday

3) Did your sister tidy her room yesterday?

b) we lived in London last summer

we didn't live

did you live

c) talked

didn't talk

did Sandra and Elsa talk

2.

she waited for the bus

they invited

I didn't live

did you like

didn't visit

did your grandparents dance

stoped

didn't water

didn't study

rained

did she try

ended

walked

washed

didn't work