Standard weak 2♥ by South.

West should probably bid 3♠ to show a strong hand with solid ♠ s.

East has a difficult decision. 3♠ support is good, the ♥ Q doubleton not great nor the 6 HCPs.

Take your pick

East opens 1♥ with an easy rebid of 2♥ .

Here with 5322 balanced hand and a stop in the unbind Major and 12 HCPs 2NT is probably better than 2♦.

East has most of points outside ♥ s so helps with NTs so pass is good, though it goes off 1 as does 3♥ s which is the alternative bid. 

South is a strong 14 HCPs and with a 4 card major in 4432 shape, opening 1♥ and rebidding 1NT over 1♠ might be best option.

particularly here as west will bid 2♠ over 1♥ or 1NT.

Here with 1♥ , 2♠ north has to decide between 4♥ or 3♠ (which many will take as denying support but looking for a ♠  stop for 3NT, so you end up in 4♥ either way.

If West does not over call with 2♠ , north May splinter with 3♠ showing a void or Singleton in ♠ s and game values this would lead to 6♥ s which with normal (statistical play) which will go one off when one plays the normal finesses in ♦ s loses to the Q.

North opens 1♠ 

South has to decide between 2♦ and 2NT. I think 2♦ is probably better as no stop in ♥ s the other major which becomes an obvious lead in NTs.

partner shows shape with 3♣ and more values than a rebid of ♠ s.

south then has a bid of 4♠ with 3 card support and values in north’s second suit.