My nephew (7) answered the loaded question "What colour is a banana?", "Black". The priest's Children's Talk was thrown off course. "Come on, Tim, "you know a banana is yellow." "Ours aren't, Mum never buys them until they are half price." As the congregation hooted, my sister was 'as red as a tomato'.
How do you know which form of the word gialla to use? As in gialle, gialli etc
Depends on the gender and number of the noun. Use the singular suffixes (o/a) for singular nouns and the plural suffixes (i/e) for plural nouns.
It works just like ragazzo: un giallo ragazzo, una gialla ragazza, i gialli ragazzi, le gialle ragazze.
Bananas are good!
We don't say this is in English. Grammatically correct but who use it in this way?
The ending of this adjective (giall-) changes to match the subject is referring to (in this case "banana")
This should also mean "bananas are yellow" even if banana is singular, the expression will be used for that purpose.
Maybe it's used for that purpose, but would you not put it in the plural if that's what you really meant?
"Una" is indicating you the number. Just one banana. Bananas are yellow is "Banane sono gialle"
Banana is indefinite, like "a", "A banana is yellow", which, on whole, means bananas are generally yellow. It works in Spanish...
banane is plural, just so you know it. "una banana" not "una banane" it would be "le banane"