Answer:
1. I went to France last month and met a wonderful boy there. If I <em><u>hadn't gone</u></em> to France, I <em><u>wouldn't have met</u></em> Pierre.
2 My boyfriend keeps <em><u>ringing</u></em> me late at night and I don't really like it.
3 They apologised for <em><u>arriving</u></em> late and promised <em><u>not to do</u></em> it again.
4 I work in a factory, but I don't like it. I wish I<em><u> worked</u></em> somewhere else.
5 Kate was late for her plane, and she didn't go on holiday. If she <em><u>had not been</u></em> late for her plane, she <em><u>would have gone</u></em> on holiday.
6 They left without <em><u>saying</u></em> goodbye because they couldn't <em><u>miss</u></em> the last train.
7 Where can you get clothes <em><u>made</u></em>? I need <em><u>to get </u></em>a new suit for my wedding.
8 If you dream about <em><u>becoming</u></em> famous, then you should try and make your dream <em><u>come</u></em> true instead of only <em><u>thinking </u></em>about it!
9 I didn't study and I failed the exam. If only I <em><u>had studied </u></em>more!
10 I went to see a horror film and I can't sleep at night now. I wish I <em><u>hadn't gone</u></em>!
11 They managed <em><u>not to be</u></em> late yesterday although the traffic was terrible.
Explanation: