DICCIONARIO ITALIANO-INGLÉS

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.

Built on a tidal lagoon,Venice is often affected by high tides, especially in October, November, and December. Acqua alta (high water) is when the water level rises more than 80 cm and floods the lowest-lying parts of the city. Sirens are sounded to warn Venetians when there is a risk of flooding.