I think e I don't think non vengono mai usati da soli, ma vengono sempre seguiti da so, come nell'esempio, o da una proposizione come nel caso di I think/I don't think he went to the concert.
Situated near the Adriatic coast in central Italy and just 61 km2 in size, the Republic of San Marino was founded in 300 AD. Its capital is the City of San Marino and its official language is Italian. It is an independent state and not a member of the EU.