Spanish language Q&A Forum

Is it interchangeable to say something like

Just as 'tal vez' and "quizás" are interchangeable, with no fast rules on them, is it the same for using quizá and quizás or is there some guide for when they can/can't be used?

also, is it impossible to use quizá/quizás/tal vez using future tenses? 
examples:

"Quizá iré a la biblioteca pasado mañana"
"Tal vez conocerás aquel varón cuando venga"
"Quizás recibiré una mejor evaluación cuando mejore mis debilidades en mi trabajo"

"Ellas han tenido que ser acompañadas...."

could this also be translated "Ellas tuvieron que ser acompañadas"?

thanks,

-alf-

Ellos proveyeron de alimentos a los damnificados.
They provided food to the victims.

Where does the 'de' come from here?

Jugué al tenis ayer.
I played tennis yesterday.

Where does the 'al' come from here?

Thanks