1:
1,would type
2,know
3,would look
4,played
5,wouldn't make
6,were
7,had
8,would visit
9,gave
10,would buy
2:
1,helped/would do
2,would water/stayed
3,had/would buy
4,offered/would take
5,would have/lived
6,would sell/repaired
7,used/would be
8,would be/taught
9,visited/would go
10,would come/planned
3:
1,if they were rich,they could help us
2,if he did his homework,he wouldn't be punished
3,if he had enough time he would help me
4,if she took any exercise,she wouldn't be overweight
5,he wouldn't go to class late if he had a bicycle
6,i could do homework if i were good at english
7,if he practised speaking french,he would spoke it fluently
8,if it didn't snow heavily,the meeting couldn't be cancelled
9,if it won't rain,we would go
10,if john didn't eat so many chips,he wouldn't be fat
4:
1,If people didn’t throw rubbish in the street, it would look attractive
2,if it weren't so many billboards in our city,people could enjoy the view
3,if it weren't so much light in the city at night,we could see the stars clearly
4,if we didn't turn on then heater all the time,we wouldn't have to pay three million dong for electricity a month
5,if the karaoke bar didn't make so much noise almost every night,the residents wouldn't complain to its owner
6,if she didn't work in a noisy office,she wouldn't have a headache after work every day