Answer:
Two in a whole and four in a pair. Six in a trio you see. Eight's a quartet but what you must get is the name that fits just one of me.
My first half means container. Not a lot of people understand my language. What am I?
What is always coming but never arrives?
I am merry creature in pleasant time of year as in but certain seasons I sing that you can hear; And yet I'm made a by-word A very perfect mock; Compared to foolish persons And silliest of all folk.
The more you look at me The less you see.
The warmer I am the fresher I am.