The verb pasar (conjugation) is regular. It means to pass, to spend time or to happen. The conjugation is shown in the table below.

Yo paso por allí.
I pass by there.

¿Cuándo pasas por la casa?
When do you pass by the house?

Eso le pasa a cualquiera.
That can happen to anybody.

Pasamos por allí todos los días.
We pass around there every day.

Si pasáis por Sol, me esperáis.
If you all pass by Sol, you wait for me.

Las modelos pasan por la pasarela.
The models pass on the runway.

pasar vs. gastar

“To spend” is usually pasar when referring to time, but gastar when referring to money or effort. “To misspend or waste” can be rendered as perder (to spend/waste/lose time) and malgastar (to misspend/waste money or effort).

Pasaron tres días en Taxco, México, donde gastaron todo el dinero que traián consigo.
They spent three days in Taxco, México, where they spent all the money they had with them.

Malgasté doscientos dólares y perdí un par de días tratando de reparar mi coche.
I wasted $200 and a couple of days trying to get my car fixed.