仮定法で困っています。
英語の仮定法の問題で困っています。一応自分でやってみたので、間違っているところがあったら指摘してください。
Ｑ空所に入れるのに最も適当なものを、それぞれ下の(1)～(4)のうちから１つずつ選んでください。
(1)I could have gotten much more for the painting if I （ ） it overseas.
(1)had sold (2)would sell (3)have sold (4)sold
自分の答え→(2)
(2)（ ） your help, I wouldn't have been able to accomplish this project.
(1)Were not it for (2)If it had not for (3)Had it not been for (4)If it is not for
自分の答え→(1)
(3)I do not deny that your information was invaluable. （ ） it, I could never have formed our plan.
(1)Far from (2)In spite of (3)With (4)Without
自分の答え→(4)
(4)Had I known you were coming to Tokyo, I （ ） to the station to meet you.
(1)would have gone (2)didn't go (3)had gone (4)would go
自分の答え→(3)
(5)The man at the window must be a spy, since he works slowly and keeps looking around. A real cleaner （ ） the windows twice.
(1)had never washed (2)was not washing (3)would not wash (4)did not wash
自分の答え→(3)
問題は以上です。よろしくお願いします。
補足
参考になりました。ありがとうございます！