Hole Cards     Board Cards  
       

Here you can use the two Jacks in your hole cards to make a set of Jacks (three Jacks) for a hand of J-J-J-A-9. Here you are using the Ace from the board and not the one from your hole cards. You do not have a full house with J-J-J-A-A because you can only use two of your hole cards.

 

  Hole Cards     Board Cards  
       

This time you also have a straight, using the Nine and Seven from your hole cards to make an 9-8-7-6-5 straight. You do not have a Ten-high straight as that would again require three of your hole cards.