You must read these two blogs (a little advanced, a kind of confusing), but you might be mispronouncing these important words!
http://www.ouisrael.org/tidbits/detail/Towards-Better-Davening-and-Torah-Reading-1/
http://www.ouisrael.org/tidbits/detail/towards-better-davening-and-torah-reading-Rei/
V’a-hav-ta should be pronounced mil’ra (last syllable), not the almost universal “V’a-hav-ta” (second to last syllable). The accent actually changes the meaning – it should mean “and you shall love Hashem your G-d”, whereas the mispronunciation renders it “and you loved Hashem your G-d”.
For more mispronounced Hebrew words, check this post:
http://judaism.stackexchange.com/questions/5991/words-often-mispronounced