A. The verb tense is always present tense in this sentence unlike the others.
Answer:
1 - playing should be play
2 - no would, it should be if you worked harder...
3 - I was at dinner
4 - the world would be a happier
5 - and I DON'T EITHER
6 - isnt' should was not
Explanation:
I'm sorry but could you ask the question more specifically? It does not make sense reading it out now. :) I would be happy to help if written more clearly though!