Examples
Estoy escribiendo (I am writing)
Están durmiendo (They are sleeping)
Estabas hablando (You were talking)
Hemos estado jugando (We have been playing)
Use
To emphasise an action is/was/will be in the middle of taking place
Present continuous
Estoy estudiando español
I am in the middle of studying. At this very moment I'm studying.
Simple present Estudio español At various times during the year I study Spanish
Formation
Estar + gerund/present participle
i.e. correct part of estar + -ando(ar verbs) or -iendo(er/ir verbs)
Present continuous regular -ar verbs
Estoy jugando - I am playing
Estás jugando - You are playing
Está jugando - He/she/it/usted is/are playing
Estamos jugando - We are playing
Estáis jugando - You vosotros are playing
Están jugando - They/ustedes are playing
Present continuous regular -er/-ir verbs
Estoy comiendo - I am eating
Estás comiendo - You are eating
Está comiendo - He/she/it/usted is/are eating
Estamos comiendo - We are eating
Estáis comiendo - You vosotros are eating
Están comiendo - They/ustedes are eating
Irregular verbs
Verbs that add a 'y' in present e.g. construir
Estoy construyendo - I am building
Radical changing verbs e.g. sentir,dormir
Estás sintiendo - You are feeling
Están durmiendo - They are sleeping
ir
Note that yendo is not often used. Use voy - I am going
Other tenses Change estar to the correct tense. The present participle stays the same
Imperfect continuous
Estaba jugando - I was playing
Preterite continuous (Emphasise that action was completed)
Estuve jugando - I was playing
Future continuous
Estaré jugando cuando llegues - I will be playing when you arrive
Conditional continuous
Paula estarķa jugando - Paula should be playing
Present perfect continuous
He estado jugando - I have been playing
Past perfect continuous
Había estado jugando - I had been playing

Practice: Continuous Tenses