A. Preposition Time: at, on, in
a. at for the time of day (e.g. There's a meeting at 2.30 this afternoon / at lunch time.), and at night, at the weekend, at Christmas, at the same day, etc.
b. on for days and dates (e.g. Many shops don't open on Sundays.)
c. in for longer periods (month/ year/ seasons) (e.g. I visited Italy in July, in spring, in 1994), and in the morning but on Friday morning; in a few minutes/ in six months etc. (e.g. The train will be arrived in a few minutes. (= a few minutes from now)); in ~ to say how long it takes to do something (e.g. I learnt to drive in four weeks. (= it took me four weeks to learn))
d. We do not use at/ on/ in before last/ next/ this/ every (e.g. I'll see you next Friday)
e. In spoken English we often leave out on before days (Sunday/ Monday etc.) (e.g. I'll see you on Friday. or I'll see you Friday)
away means away from home/ a place/ a person etc. in a different place, position, or situation (= walk away, run away, look away, etc.) (e.g. The woman got into her car and drove away. The due date is only a week away, but I couldn’t understand it yet. Some children’s hope is to get away early.)