Working with modals

This lesson 3 deals with modals and perfect modal are rather difficult to use. Here you have plenty of web pages to work with them. I hope it'll be helpful.

http://www.bbc.co.uk/worldservice/learningenglish/flatmates/episode65/languagepoint.shtml : a short but practical explanation of the modals with a reference to modals + perfect infinitive

http://www.englishgrammar.org/perfect-infinitives/ : here the perfect infinitive is explained and there is a reference to modals followed by this form.

http://www.englishpage.com/modals/modalforms.html : this is a revision of modals and it has a good exercise to practice.

http://www.esl-classroom.com/grammar/perfmodals2.html : an exercise with perfect modals

http://www.esl-classroom.com/grammar/perfmodals1.html : this is the second part

http://www3.telus.net/linguisticsissues/ModalsPast.htm: a long list of modals in simple and perfect form with their use and meaning.

http://ies.garciamarquez.madrid.educa.madrid.org/index.php/ingles/ingles-i-bto/352.html : a quite extensive page with exercises. Problem: no answers.

http://www.learnamericanenglishonline.com/Yellow%20Level/Yellow%20Level%20Quiz%207-%20%20perfect%20modal%20verbs.html : not very attractive but effective

http://www.learnamericanenglishonline.com/Yellow%20Level/Y12%20Perfect%20Modals.html : explanation of the previous exercises; there is a simple video with some examples.

http://www.ihbristol.com/learn-online/exercise-general/advanced/grammar/modal-verbs/31/ : this exercise is about modals. Some of the examples are followed by prefect infinitive. You can use them for practice.