Do = Modal auxiliar del presente simple. Como verbo hacer, fabricar, crear.

I do my homework.

We do their works.

They do pay to the boss.

I do cleam my room.


Does = Modal auxiliar del presente simple para 3ras personas. Como verbo hacer, crear.

She does her monography.

It does rain.

He does not clean his face.


Did = Modal auxiliar del pasado simple. Como verbo Hacer, Fabricar pero en pasado.

I did the same as You did

She did sit on the floor.

It did grow with sugar.




john did the dask of physics 

maria does the work of art