这是我第一次在公共场合发言。

It is the first time that I speak in public.

youdao

这是我第一次在公共场合发言。

It was the first time that I spoke in public.

youdao

别忘了，这是我第一次在公共场合发言。

Don't forget, it'll be the first time I've spoken in public.

youdao

别忘了，这是我第一次在公共场合发言。

Don't forget, it'll be the first time I've spoken in public.

youdao