I hope you have found the videos on the present perfect tenses useful. Sometimes it can be difficult to understand when you have to use ‘since’ and when you have to use ‘for’ with these tenses.
‘I have lived in Barcelona since 3 years.’ Is this correct? …. no! It’s ‘I have lived in Barcelona for 3 years.’
In this video you will learn the correct rules. There is also a little exercise at the end of the video for you to practise!