An infinitive is to + the simple form of the verb.
Mr. Porter will try to teach with technology.
He loves to see students learn English.
Watch English Instructor: Infinitives
http://www.youtube.com/watch?v=PghHPubYv1g
Here is a link on gerunds & infinitives. Take the grammar quiz.
http://www.englishbaby.com/lessons/grammar/gerunds_vs_infinitives?page=1
When you finish, look at English, baby! You can build vocabulary. Look at the English forums and chat rooms. There are downloads for listening.