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.
RAI 1, RAI 2 and RAI 3 are public channels funded by a licence fee; Rete 4, Canale 5, Italia 1, and the more recent La 7 are privately owned. All these are national channels, but there are also small local networks and, of course, satellite and digital terrestrial TV.