[bobjenkins]

Originally Posted by irmamar

Could someone explain to me when I have to use "to + -ing" form instead of "to + inf".?

I've also seen these two sentences and now I'm not sure which of them is the correct one:

I'm glad to hear from you
I'm glad to be hearing from you



Thanks

Sí Lo siento, no soy un experto, pero trataré explicarlo bien

I'm (was) glad to hear from you (yesterday/sometime in the past) - (en el preterit o presente)
I'm glad to be hearing from you (at this moment in the present)- (siempre en el presente)
I was glad to be hearing from you incorrecto

Tengo miedo que lo expliqué jeje. No sé las reglas, pero qué escribé ser correcto a mi oreja.

Mi español es raro jeje¿quieres que yo pueda explicar en inglés?