宇宙到底是何时开始形成的 翻译成英文 要用到强调句和being.

问题描述:

宇宙到底是何时开始形成的 翻译成英文 要用到强调句和being.

陈述句:It was ()that the universe was being formed.
疑问句:when was it that the universe was being formed?