There are a small number of exceptions, but in general:
Singular masculine nouns end in
-o: figlio = son; ragazzo = boy
Plural masculine nouns end in
-i: figli = sons; ragazzi = boys
Singular feminine nouns end in -
a: figlia = daughter; ragazza = girl
Plural feminine nouns end in
-e: figlie = daughters; ragazze = girls
Most nouns don't pair up like that, though. But the final letter is usually a good indication.
È sounds like the "e" in "bed", while "e" sounds like the "ay" in "play". Well, sort of. They "ay" in "play" kind of transitions between the sound of Italian "e" to a short "i". "E" sits a little higher in your mouth than "è", you kinda want to draw the corners of your lips up. It's a subtle difference and when you're really speaking I doubt an Italian will misunderstand you or even really notice if you accidentally pronounce one the wrong way. If you have trouble on Duolingo, use the context of the sentence to determine the correct word.
This isn't really a "modal" use of a verb, it's just a regular use, to want something. Modal verbs act more as auxiliary verbs, modifying how the main verb acts or is interpreted. I'm not exactly certain why volere is included as a modal verb - it doesn't act the same way as dovere or potere. Example:
"I can go/am able to go" = posso andare
"I must go/have to go" = devo andare
In each sentence, the modal verb modifies the main verb "go" by expressing either an ability or an obligation about the action of going.
However, voglio andare simply expresses an object of wanting ("to go" not just "go"). Perhaps this is more clear if one writes, voglio un cane = "I want a dog". Try substituting posso or devo for voglio and you get gibberish:
posso un cane = "I am able to a dog"
devo un cane = "I must a dog"
For almost all uses, you make this same sort of substitution to see that volere isn't really a "modal verb" in the same way that potere/volere are.
"A modal is a type of auxiliary (helping) verb that is used to express: ability, possibility, permission or obligation. Modal phrases (or semi-modals) are used to express the same things as modals, but are a combination of auxiliary verbs and the preposition to. The modals and semi-modals in English are:
"Can/could/be able to
"Voglio figli e figlie" Question asks student to choose among a set of given words for the English meaning of this sentence. The only choice offered for the verb in the question was "have" or "watches." Although the student knows the verb should be "want," that choice was not available.