The Best Way To Say I Don’t Know
I don’t know could be your answer to a question in the viva, but it doesn’t have to be all of your answer.
Say why.
It can be as simple as “I didn’t do that” or “I didn’t read this.” Or perhaps, “I’ve not thought about it that way, but let me have a think…”
If your first thought is “I don’t know,” say why and engage with the question.