I think "Have you bought train tickets yet?" should work as well.
Have you bought your train ticket yet? This should work as well.
Why is "你买火车票了吗“ wrong?
the pronunciation of 了 is incorrect here right ? they say "liao".
Did you bought a train ticket? OR Did you bought train tickets? Should this be correct too?
When you use DID the verb after must be in INFINITIVE So did you buy the train ticket?
Yes to YET !