No. It has the digraph vowel OI (oy).
moment has a long o sounda long vowel sound is a sound which is the same as, or very similar to the letter name of the vowel.
"Rain" has a long A sound. The letters "ai" are called a "diphthong." This means two vowels that join together to produce just one sound. Rain, pain, and train all have the diphthong "ai" and are all pronounced with the long A sound.
No. The word O has the OY or OI vowel pair, as in join, void, and oil.
No. The vowel sound is the OI/OY pair, as in boy, join, point, and oyster. It is neither long or short.
It has a long "u" sound.
Cake has a long "a" sound.
The long "y" sound is the same as the long "i" sound. The words "my" and "rhyme" have this sound.
"Can I join you?" is the most correct phrase. "Could I join you?" is also acceptable but may sound slightly more formal.
The OI pair in the word joint is an OY sound that is heard in words such as boy, spoil, and void.
The word "vines" has no A or A sound in it. The word "vanes" has a long A sound.
join
The A has a long A sound. The I has a short I sound.