Practice.

Now pronounce the sentence with the same intonation of a surprise. Imagine that you're talking to a friend. He says that when he was a child he went to the school where there were no chairs, no desks or benches. When he says this, you are very surprised. You ask "where did you sit?!" “I on sèieu?!”. After saying this, listen how to pronounce. After saying the sentence, listen how it should be pronounced.

Now imagine your roommate says that as a child he lived in a house where there were no beds. When he says this, you are very surprised and you ask "where did you sleep?!" “I on dormíeu?!”. After saying the sentence, listen how it should be pronounced.
Now imagine that your brother tells you that Marina, a girl who hasn´t spoken to him during a long period of time, has just called him. You are surprised and you ask, "What did she want?!" “I què volia?! After saying the sentence, listen how it should be pronounced.
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