@victorlara,
victorlara wrote:I don't think that an inanimate object such as a plastic bag can rip itself. Or can it?
Many verbs can be used transitively (with an object) or intransitively (no object).
Transitive:
John ripped the plastic bag.
Someone snapped the string.
I burned the paper bag.
Mary broke the glass.
Intransitive:
John's plastic bag ripped because it was full of heavy things.
The string snapped because somebody pulled it too hard.
The paper bag burned when I threw it in the fire.
A glass broke when Mary dropped it on the floor.
Quote:I'd be grateful if someone could clear this out for me.
... clear this
up for me.