The present participle is the part of the verb that ends in -ING in English.
For example: I spend two hours a night studying.
To form this in Spanish take the infinitive and ...:
| REMOVE | -ar | ADD | -ando |
| -er | -iendo | ||
| -ir | -iendo |
Por ejemplo:
Jugar (to play) -> jugANDO (playing)
Comer (to eat) -> comIENDO (eating)
Escribir (to write) -> escrIBIENDO (writing)
Use the verb PASAR (to spend) to show how much time you spend doing something.
Por ejemplo:
¿Cuánto tiempo pasas estudiando?
Paso dos horas estudiando