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.
From the Latin feriae Augusti (August holidays), ferragosto is August 15, Assumption Day. It is a public holiday in Italy and the day when everyone enjoys a day out at the seaside, in the country, by the lake, or in the mountains.