 Activity for teaching the present perfect, since or for. These two words are often confused by students of the English language. Therefore it is recommended to spend quite some time covering their differences. Have your students form an equal number of statements using since and for, and share them with the class. Start a discussion about the sentences and explain any incorrect usages. If you like this video, please subscribe by clicking the button down here and click on any of the videos here on the left for more interesting teaching tips for getting certified to teach English abroad and online.