yes — used to confirm that the person being addressed is listening

• Ты сказал да или нет?

  Did you say yes or no?

  Tatoeba · marafon · CC BY 2.0 FR

• Да. Нет. Может быть. Не знаю.

  Yes. No. Maybe. I don't know.

  Tatoeba · marafon · CC BY 2.0 FR

right, isn't it — used at the end of an affirmative sentence, turning what was said into a question, asking for confirmation

• Все знают, что им делать, да?

  Everyone knows what they have to do, right?

  Tatoeba · marafon · CC BY 2.0 FR

• Я же твой друг, да?

  I am your friend, right?

  Tatoeba · marafon · CC BY 2.0 FR

really — used to express surprise or ask for confirmation

• "Весело было?" - "Да не особо. Было скучно."

  "Did you have fun?" "Not really, it was boring."

  Tatoeba · Selena777 · CC BY 2.0 FR

• Да не, всё правда в порядке.

  No really, I am fine.

  Tatoeba · ZegPhig · CC BY 2.0 FR

and

• Я стала кожа да кости.

  I wasted away to skin and bone.

  Tatoeba · Balamax · CC BY 2.0 FR

• Том чисто кожа да кости.

  Tom is all skin and bones.

  Tatoeba · Ooneykcall · CC BY 2.0 FR

but

• Что с ногами, да не ходит?

  What has legs, but cannot walk?

  Tatoeba · whatnot · CC BY 2.0 FR

• Друзей легко найти, да трудно сохранить.

  Friends are easy to find, but they're hard to keep.

  Tatoeba · Wezel · CC BY 2.0 FR

a "yes"

an affirmation in support of a cause — as used in slogans or appeals

da, deca- — x 10

yes

let, may

In many cases, emphasises impatience or irritation, but in others may simply emphasise surprise or an observation — Used as an emphasiser, usually at the start of a sentence or phrase

Used as an emphasiser before an imperative verb to express urgency