Do you remember when to use present simple and when to use present continuous?
We use the present simple to talk about habits (the things that we do regularly), facts (things that are always true) or states (facts that are true for a long time).
We use the present continuous to talk about an activity that’s happening now, (or around now) or to talk about planned future arrangements.
Look at the sample sentences on this BBC web page.
Is it …
Where were you yesterday?
Where have you been yesterday?
Where had you been yesterday?
Where will you be yesterday?
Do this little quiz (link to br.de) – with its 16 questions – to find out whether you know your English tenses.
A lot of people don’t seem to know this, but if you are sure that something is going to happen in the future (you’ve planned it and you’ve organised it), then you can use the present continuous. Don’t know what that is? Take a look at the BBC site here and do the little quiz here.