на́до

very common #82A2

1.
must, have to, it is necessary, need to
На́до поверну́ть в э́тот переу́лок.
We need to turn into this alley.
Impersonal; the person is in the dative: мне надо, ему надо. Past: надо было.
2.
to need, to require
Мне на́до два биле́та.
I need two tickets.
With a noun: мне надо + accusative or genitive.
3.
over, above
Все смею́тся на́до мной!
Everyone is laughing at me!
Variant of над used before certain pronoun forms: надо мной.

Usage info

не надо: don't

Core obligation and need
- на́до + инфинити́в
  need to; have to (impersonal)
- кому́ на́до + инфинити́в
  someone needs to do something
- кому́ на́до + сущ. (И.п.)
  someone needs (a thing)
- его́ на́до + инфинити́в
  he needs to be ...; we should ... him
Questions, softening, reactions
- на́до бы + инфинити́в
  it would be good to; should probably
- а на́до ли + инфинити́в?
  do we really need to ...?
- На́до же!
  Unbelievable!; Imagine that!
- Что тебе́ на́до?
  What do you want? (confrontational)
Time reference (past/future)
- на́до бы́ло + инфинити́в
  should have; it was necessary to
- на́до бу́дет + инфинити́в
  will need to