Try this: Put you tongue in the position for saying YEE, but from that position you still attempt to say LEE without using the tip of your tongue. Hence the point of contact between the tongue and the roof of the mouth is further back than it is for the normal LEE. A simple YEE does not contain this all important momentary contact.
Nice try but that is not what I meant. There's indeed a french word for parasol too (parasol) but an ombrelle is this : http://givernews.com/images/photo11/femme-ombrelle-gauche.jpg
"The umbrellas are his" would be "gli ombrelli sono i soui". The reason why it's "i suoi" is because possessives take the form of the subject. "Ombrelli" is a plural masculine word so it would only get the masculine possessive forms " i miei; i suoi; i nostri; i vostri". Now the tricky thing to remember is that "gli ombrelli sono i suoi" could also mean "the umbrellas are hers" as well.
What you wrote was "The umbrellas are mine".