If you really want to know the difference, do not miss the following answer given by Catherine Chapman, who works as an ELT writer for BBC Learning English.
You've got the possibility of listening to her, reading her answer and do an online quiz to check your understanding! All three in one! It's really practical.
http://www.bbc.co.uk/worldservice/learningenglish/grammar/ask_about_english/081007/
Four in one. Just look out of the window! THAT's rainy. Nice weather for ducks! Good-bye, summer!
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