We use the present tense to talk about actions that are happening now and we use the future tense to talk about actions that will happen in the future. That is easy to understand. But wait a ...

We can use the present continuous to talk about the future when we have already arranged to do something. It's definite, not just an idea. Perhaps we have put the arrangement in our diaries.

There are some verbs that we don’t usually use in the continuous ... (g) Not right now. [Use the present continuous for things that are/aren’t happening now.] 3. Do you work here?