Student or Learner
When to use was not and has not in a sentence?
Welcome to the forums, Yogaraj. Do you know what the words "was" and "has" mean? If not, look them up in a dictionary. You could start here: http://www.onelook.com/
Then you can write some sentences showing how you think they should be used and post them here for us to consider.
"Invading armies have no rights." Noam Chomsky