Hi everyone,
I am doing my 3rd year PhD in the UK and i was invited to deliver a guest lecture for a group of undergraduate students. I am more confident with writing because i can check the errors whenever i want. However, when delivering a lecture, i believe that there will be several mistakes in grammar and vocabulary use. I have done many rehearsals now and i notice that it will surely happen during the lecture. I am from the South East Asian countries, so English is not my mother language. Do you think that will be fine for students if i say something wrong in grammar and some incorrect vocabularies?
Thank you

It is fine. Students have lectures from non-native English speakers. Just do your best.

Having had many lecturers with bad English or a thick accent I can safely say it doesn't really matter. Some of the most memorable bits of my course was when the lecturer said something very important in stunted English.

I think it'll be fine as long as your content is good. That's what people really appreciate.

Good luck!

Agree with the above. No one cares - only about the science. Enjoy your talk!