You're talking to someone whom you address as tú, telling him/her what to do (Close the door, Bring a dessert, etc.) For regular verbs, the forms you use will be identical to:

Given the answer to Question 1, how many affirmative tú commands end in -s?

Now you know where regular tú commands come from, so try typing out a few. What's the command for bailar? (Click Check after each answer; use menu below for á, é, ñ, if necessary.)

And the command for aprender?

How about recibir?

And pensar?

And defender?

And volver?

What about repetir?

What's the command for oír (handy for getting someone's attention)?

And reír?

So far, all the forms have been regular, in that they've all followed the rule covered in Question 1. Now do some irregular verbs; what's the command for decir?

And tener?

What about salir?

And hacer?

And ir?

What about ser?

What about venir?

A few more, regular and irregular: What's the command for conseguir?

What's the command for devolver?

This one's a little tricky: what's the command for suponer?

Now this one should be easy: what's the command for mantener?

OK, here's a curve ball: Try contradecir.