I had become angry, however when I cooled down and reflected upon my behaviour, I realized that I was a selfish act that I could easily hurt or put myself and others in danger.
They couldn't hear me,.......? (Supply the correct question tag)
They couldn't hear me, <u>could </u><u>they?</u>
Here we used '<u>could they?'</u> as the question tag because couldn't which is negative has already been used in the question. Then, the question has the subject as 'they' which is plural, so 'they' is also used in the question tag.
