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.
Carnival time in Italy runs from Epiphany (6 January) until Ash Wednesday. The most famous carnivals are those of Venice, Viareggio, Ivrea, and Putignano. There are parades with floats and fancy-dress parties for children and adults alike.