Australia may qualify for the semis, and they have weak opponents lined up for all of their 3 remaining matches (England, Afghanistan and Bangladesh). For New Zealand, things are not that difficult as their remaining opponents are Pakistan and Sri Lanka. The Pakistan vs New Zealand match is like a knockout. The winner of that match will have a great chance of qualifying for the semi-finals. Pakistani has the match against England coming up as well. Afghanistan need to face South Africa and Australia, so I am not much hopeful about them.
Afghanistan already have done a good job in world cup as they have won 3 games. There only mistake is that they lost to weakest side of this tournament i.e Bangladesh. For Afghanistan it's like winning the World Cup. NZ already know that rest of there games are very crucial to qualify for semis. Pakistan have not secured any win so far against strong teams so there chances are less for semis.