You can have a look at this presentation to revise the grammar about gerunds and infinitives.. I also remind you that in the Grammar Appendix in your books you can find more about this...
Gerunds and infinitives from f2teacher
You can also practise HERE
This is another link to practise online!! Have a try!!
http://www.ego4u.com/en/cram-up/grammar/infinitive-gerund/exercises?30
You can also practise HERE
This is another link to practise online!! Have a try!!
http://www.ego4u.com/en/cram-up/grammar/infinitive-gerund/exercises?30