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She doesn’t live in London because she doesn’t know anyone there → She would (a)  

I can’t live in the country because I can’t find a job there → I’d (a)  

I don’t have a spare ticket. I can’t take you to the concert → If I have (a)  

The school children forget to water the trees so they don’t grow. → If the children didn’t (a)  

They don’t understand the problem. They won’t find a solution → If they understand (a)  

He sits around too much. He isn’t fit. → If he doesn’t (a)  

Carol doesn’t answer the phone because she is studying. → If Carol wasn’t studying, (a)  

Rita is exhausted today because she doesn’t get enough sleep. → If Rita got (a)  

She’s very thin; perhaps that’s why she feels cold. → If she wasn’t (a)  

He never polishes his shoes, so he never looks smart → If he polished (a)