Spanish language Q&A Forum

I have 2 questions about "no puedo esperar a ver":

1. First I was surprised by the 'a' after 'esperar'.  When do you use this construct rather than esperar on it's own? 

2. In the grammar link for that sentence it says that you shouldn't use this construct at all, so when should you vs when shouldn't you:

"Literal translations from English to Spanish don't work. In this context, do not use this type of construction in the English way:

"Estoy mirando a..." (I am looking forward to...)

"No puedo esperar a..." (I can't wait to...)"

Are there other examples besides just these? I have a Spanish dictionary that says that the word "internet" can be either feminine or masculine, with both "la internet" and "el internet" being correct. Could you provide any other words that do the same besides just the few that are provided in the lesson? 

Is it correct to say: Ya me pongo a duchar

Or should it reflector that both verbs are reflexive ie: Ya me pongo a ducharme. 

The latter just sounds a little weird to me. 

What are the other words for adios. Like other slangs which are used in other Spanish speaking countries. Like chao. Are there any other words?