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.
It is hard for an Italian to imagine a meal without pasta, whether cooked plain, with a sauce, in a soup, or baked. Pasta may be fresh or dried, made with egg, or from durum wheat. It comes in all shapes and sizes and each region has its specialities.