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.
The bora is a cold wind that blows in Italy, especially in winter, and is particularly associated with Trieste, where it reaches speeds of 150 km per hour. The streets of the city centre are fitted with ropes and chains to help people get around on particularly windy days.