21. Prepositions of Time 2

Use during to say WHEN something happened (within a period). - "We slept during the movie." (Not 'during 2 hours').

Use for to say HOW LONG. - "We slept for 2 hours."

Use since with Perfect tenses to show the starting point. - "I have been here since 9am."

- During the night (Noun) - For 6 hours (Number/Duration) - Since Monday (Name of day/time)