presente simple = yo duermo
+ I sleep- I do not sleep
? Do I sleep?
presente continuo = yo estoy durmiendo
+ I am sleeping- I am not sleeping
? Am I sleeping?
futuro simple = yo dormiré
+ I will sleep- I will not sleep
? Will I sleep?
pasado simple = yo dormí / dormía
+ I slept- I did not sleep
? Did I sleep?
presente perfecto = yo he dormido
+ I have slept- I have not slept
? Have I slept?
presente perfecto continuo = yo he estado durmiendo
+ I have been sleeping- I have not been sleeping
? Have I been sleeping?