1) Paul said he was looking forward to seeing Mary again.
2)I have finished reading the article.
3)i have always tried to help /helping people when they needed my help.
4)Can we afford to buy/ buying these devices?
5)Did you have a good time to play/ playing football?
6)I'm used to getting up early and doing my homework in the morning/
7)chear up and keep smiling.
8)Never forget answering letters you get.
9)His accent is easy to understand
10)She is clever enough to answer all your questions/
11) You should stop him from flying to Vladivostok.