Train yourself.

Now pronounce a sentence with the same requesting intonation. Imagine that you are speaking with a friend. You really want this friend to come with you to the cinema. You asked her many times before. Thus, almost begging, you ask once again “Va... Per què no vens...?” (Come on…Why don’t you come?). After practicing, listen to how it is pronounced.

Now, imagine that you are speaking with your brother. You have been asking him for some time to do something but he always said no. Thus, half begging, you ask him “Va... per què no m’ajudes...?” (Come on… Why don’t you help me?). After practicing, listen to how it is pronounced.
Now, imagine that you are speaking with your best friend. You have been asking her for some times to come to visit you in your town. She accepted, but she hasn’t come yet. Thus, almost begging, you ask her “Va... Quan vindràs...?” (Please… When will you come?). After practicing, listen to how it is pronounced.
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