Deal 8 ♠  
 
 
♣  
 
 WEST  NORTH  EAST  SOUTH
33♠ BID 
 

The bidding has been as shown.
Decide what you would bid, then click on BID above.


  ♠ 8 6 3 2
K 8
A 9 6 4
♣ A 7 3
 

 
Deal 8 ♠ 4
6 5 2
K Q J 10 8 7 3
♣ 8 5
 
 WEST  NORTH  EAST  SOUTH
33♠4
passpasspass

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Decide what you would bid, then click on BID above.


You do not have the 4 fast winners you need to raise partner to the 4-level.
But you do have 4 of his trumps and 2 and a half winners. And your side doesn't have much defense against a 3♠ contract.
You should raise partner to 4 because you think they can make 3♠. With these hands it appears they might have gone to 4♠ in which case you would have had to decide whether to continue to 5. More judgement would be called for, based on Vulnerability, whether you think they can make the game, etc.
The Law of Total Tricks can be a help in these competitive situations; it would lead you to 5.


 Deal 9 
  ♠ 8 6 3 2
K 8
A 9 6 4
♣ A 7 3