In Spanish how do you decide whether you need the indicitive,infinitive, or subjunctive form of a verb?

Answer 1

the "indicative" mood, which presents information as actual, objective fact, is the present tense, e.g. "Yo hablo" I talk

the "subjunctive", used to discuss potential or hypothetical events, or events portrayed subjectively.
"Es probable que yo hable con ella" I may talk to her

The infinitive is the most basic form of a verb. In Spanish, infinitives always end in -ar, -er, or -ir. In English, the term is usually used to refer to the "to + verb" form of the verb such as "to run" or "to eat,"
"Es fácil hablar con ella." It is easy to talk with her.
Hope this helps!
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Answer 2

Segun cuanto tequila te has bebido.

Un tequila - Bebo tequila.
Dos tequilas - Sera que sigue bebiendo o ya le paro?
Quince tequilas - Yo hablar español donde estar el baño voy a vomitar infinitivamente.

Answer 3

I think inesmon gave you a very good explanation + examples.

Answer 4

Speaking Spanish is NOT so complicated. When the case comes, you use it

Answer 5

inesmon`s answers are correct.