Infinitive or gerund

I can't afford ... an expensive car right now. buying to buy It was so impolite ... you to ask Tina about her age. for of from Jim begged me ... offended. not being not to be The teacher suggested ... to St.Petersburg for the weekend. going to go It's necessary ... you to follow the instructions. for of from I was so furious that I refused ... any of her questions. answering to answer My friend failed ... for the conference, so he won't join me. registering to register I couldn't resist ... the cake, although I am on a diet. trying to try I offered ... him a lift home, but he refused politely. giving to give I couldn't help ... when I saw the video of the challenge he had done. laughing to laugh Jason denied ... the money from Dad's wallet. taking to take It's no use ... questions at him. He won't tell you anything. firing to fire I expect you ... on time! Don't be late, please! coming to come I was about ... the classroom when the teacher called my name. leaving to leave Sarah is too young ... on her own. travelling to travel It was stupid ... him to drive so recklessly. for from of There is no point ... calling him, he won't pick up the phone. - in at