It's a good question. So in order to refresh your minds, I invite you to have a look at this web site which explains the differences you're looking for and provides you online exercises.
You also can do this additional exercise...
http://www.learn4good.com/languages/evrd_grammar/article_ex2.htm
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgqjsxRq-K5nogfY7m_3nymZtkGvOapz4EIWFXQBAc_gtgX963o44kAdJ90Pus9PNncGzpaP41zc1UYQqsLdyQQZJ2LWIMeFBIN0_zB2NLl2emB3WPNHDffEEk1z_PmT0rpUWNzSSVWwiNF/s320/gifs+00+%2812%29.gif)
Enjoy them and have a FUN moment! ....
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