Dear, restriction is necessary. so when you are discussing in urdu there should be urdu tone and when in english there should be english tone. And when you start discussing keep in mind that a person is on average speaks for 50 to 60 seconds. And keep one thing more in mind that you have to connect your point of discussion, either in agreement or disagreement, with the last person's view point. For example G main aap k nezriay sey ittefaq/ikhtilaf kerta/kerti hoon kiu k............................................etc etc. in this way discussion continues.