4 ms·I used the present tense.by jdkfglkjh34 5y agoI used the present tense.ghusbands 5y agoYou also said "modern". If guerilla warfare predates modern times, it can't be caused by something in them.Zababa 5y agoIf you add "being effective" to "guerilla warfare" it works, I think that's what was meant.Talanes 5y ago"Cause" doesn't necessarily mean originate. They could have meant it in the same way that one could say "leaving food out will cause you to get ants."