Future and future in the past

Apart from the explanation in the grammar section you can watch this video for an interesting overview:

However you may feel the need for exercises. TRY AT LEAST ONE to see if you fully understand these tenses : in English lessons, learnenglishfeelsgood, and englishexercises.

future perfect

As for the future in the past, check this link from the BBC or this one from englishpage. Interested in online exercises? Try this link from OUP. All the exercises just take less than 5 MINUTES.

Remember you have a great site in http://www.bbc.co.uk/worldservice/learningenglish/ for all kinds of stuff.