1. There is no explaining this failure.

2. Crossing the river here is dangerous.

3. Arguing with him is a waste of time.

4. Learning a foreign language takes a long time.

5. Does walking in the rain make sense?

6. Child-rearing is a difficult process.

7. Bothering him will only make him angrier.

8. This time of the year the only way of getting there is by plane.

9. You coming over will make no difference.

10. It's impossible to prevent him from doing that.

11. Smoking is dangerous for the health.

12. Exchanging letters with the British helps perfecting your English.

13. Exercising in the morning is important.

14. Sleeping outdoors is healthy.

15. Reading England history books is a pleasant and useful activity for a future English teacher.

16. Traveling to the sea was necessary for the entire family.

17. There is no arguing with his proper behaviour.

18. Swimming is my favourite sport.

19. Entertaining guests is complicated.

20. There is no pleasing him.

21. No use calling him, he is not home at this time.

22. Watching soap operas is a waste of time.

23. Meeting her seemed like a good end of the day.