Is Corsica and sardinia part of Italy?
Sardinia is part of modern day Italy , Corsica is not.
The Kingdom of Sardinia was one of the driving forces behind Italian reuinification.
Corsica however is still occupied by France (and possibly kept the island, as France supported the italians against the Austrian Empire).
The Corsican language is pretty much a tuscan/italian dialect, though it's use is being surpessed by the french ("only one language in the Republic ,and that is french" )
Most all corsicans can speak french (even though many consider corsican/italian their native speech)