за

Daily used word (top 100)

1.
behind
за + location in instrumental case
Гара́ж нахо́дится за домо́м.
The garage is behind the house.
2.
at (location)
за + location in instrumental case
Го́сти сиде́ли за столо́м и у́жинали.
The guests were sitting at the table and having dinner.
3.
at (direction)
за + location in accusative case
Го́сти сня́ли пальто́ и се́ли за стол.
The guests took off their coats and sat at the table.
4.
for (in support of)
за + object in accusative case
Он голосова́л за Тра́мпа.
He voted for Trump.
5.
for (mistake for)
за + object in accusative case
Его́ при́няли за её́ му́жа.
He was mistaken for her husband.
6.
for (reason)
за + object in accusative case
Он отсиде́л 5 лет за ограбле́ние.
He did 5 years in prison for robbery.
7.
for (duration)
Он работал там два месяца.
He worked there for two months.
8.
following after, chasing after
за + object in instrumental case
Почему́ он бежи́т за на́ми? Что он хо́чет от нас?
Why is he running after us? Does he need something?
9.
over (a certain age)
за + number in accusative case
Я ду́маю, ему́ уже за 50.
I think he's over 50.
10.
beyond, on the far side of
за + object in instrumental case
Что лежи́т за преде́лами наблюда́емой Вселе́нной?
What lies beyond the edge of the observable universe?
11.
out of (location)
за + object in instrumental case
Я был вчера́ за́ городом.
I was out of town yesterday.

Usage info

за то: for the fact за это: for this за...До: From...to

is used for: (i) Thanking, paying, rewarding, punishing for (ii) Identifying, evaluating as (iii) Seizing, holding, leading by (iv) Feelings experienced on behalf of someone else (v) The meaning ‘in favour of’

Note: "Что это за" in the meaning "какой" does not affect the case of the dependent noun.

to the place behind/beyond (movement) - за + object in accusative case seeking advice: за + Noun (Instrumental)