No! Once thawed, you cannot safely refreeze shrimp.
No! never refreeze any food that has been thawed!
If they've been frozen and thawed, no.
You can refreeze thawed vacuum food as long as it has not been open, if It has been open you can still reseal and refreeze it but you do run the risk of your food spoiling due to the introduction of bacteria into the food.
Only if they have been cooked. Never refreeze uncooked thawed meat.
Not if it is raw and has been fully thawed. You can cook it and then refreeze it. Put it in an air tight container.
no once it has thawed you cannot refreeze it