What has a ring but no finger?

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

When we see 2 but call 10?

Which is the correct shadow of the bird?

Who has married many women but was never married?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?