]Welcome to the forum, Niki.
We need more context. All of the following sentences are fine:
I will be very pleasant to your parents when they come.
I would be very pleasant to your parents if they accepted me.
I will/would be very pleased to see you this evening.
Please try to give your threads a useful title. 'Will/would be pleasant?' would have been more useful for this one.
Student or Learner