What is the difference of para comer and de comer?
When to use para comer, de comer, en comer, por comer. Thanks very much..
4 Answers
Que tenemos para/de comer? = What do we have for eating/dinner etc...?
Por comer mucho, engordé = because I eat too much, I got fat.
En comer no está lo malo, puesto que lo necesitamos, en comer mucho es cuando se vuelve poco saludable. (homework) 
Here's the first two:
If you want to say, "We are going to a restaurant to eat", you could say:
Vamos a un restaurante para comer. - In this case, "para" means "in order to".
If you want to say, "I'm going to watch television before eating", you could say:
Voy a mirar la televisión antes de comer. - "antes de" is a preposition meaning "before".
Tosh is right.
However if you are determining the uses of the adjective form of "de," then you could say, ie:"Ya es la hora de comer" (it´s now dinner time).
"Los taquitos son para comer" (the tacos are for eating).
Por comer mucho, me engordé (from eating a lot, I became fat).
En could possibily be used as por with comer, but it wouldn´t be common.
Con comer tanta poca comida, no puede adelgazar.
