1. We expect seeing/to see them at the party tonight. 2. I keep getting/to get e-mails from people I don't know.
3. They're planning building/to build a new leisure centre in town.
4. We can't afford travelling/to travel abroad on holiday this year.
5. Have you ever considered becoming/to become a vegetarian?
6. I'm very tired and I want staying/to stay at home tonight.