Question

There were six hundred delegates in the conference hall? give question tag​

Answer 1

There are two possible question tags,

Explanation:

Question 1: Were there six hundred delegates in the conference room?

Question 2: How many delegates were in the conference room?

In the given Q1, the sentence has been restructured by simply adding 'were', a verb.

In the given Q2, the sentence has been changed by taking out the number of delegates mentioned. For instance, there is a possibility that the question-seeker wants that this number should not be mentioned. In that case, we can make use of "How many".