Good Riddles

Question: My first is in yesterday, but not in today; My second is in after, but not in before; My third is in start, and also in stop; My fourth is the 20th letter of the English alphabet; My fifth is in correct but not in wrong; and my sixth is in pretty, but not in cute. My whole is something celebrated by Christians. What is this teaser referring to?

Question: What's small like a mouse but protects like a lion?

Question: What has four legs, breathes, but doesn't move?

Question: At work a lady is requested to move a 2 ton machine with out any assist.How is she able to move the item?

Question: A guy writes in his journal. He writes "Hey, journal, today I... 'Dinner is ready!' Is what his wife said." But the guy had no wife. How is this possible?