Yes
Raw shrimp cannot be refrozen. This is because the raw shrimp will get freezer burned and could grow harmful bacteria.
If the food has been thawed under refrigeration and has not started to spoil, food can be safely refrozen. Partially thawed can be refrozen, too. But the extra freeze-thaw cycle will cause degradation of quality. It might be better to cook the food, then freeze it.
no because they have froze
It is not recommended to eat any foods that have been frozen, thawed and refrozen. You can, however, thaw food, cook it, and then freeze it.
no
because it can who told you that?
No foods should be refrozen after they have thawed.
no once it has thawed you cannot refreeze it
Yes
Thawed shrimp is stored in a drip container with chipped ice on top of the shrimp to allow draining
It is best not to re freeze thawed food. However if you cook the thawed rhubarb first, and allow it to cool you can then freeze the cooked rhubarb.