To play this video you need to enable JavaScript. Do you have a question you want us to answer? You can send us your questions to learningenglish@bbc.co.uk 1. We can use both present perfect and past ...

I still remember one of my first big speaking engagements. I spent weeks preparing, rehearsing every word and perfecting my slides. I wanted to be flawless. But when I stepped onstage, something ...