Difference between e, wa, etc

[seanblue]

Check out a previous post of mine, linked below. However, I don’t think 交ぜる and 交わる are verb pairs, so it probably doesn’t apply to them. It would apply to 伝わる and 伝える though.

Do you have a technique to remember transitive vs intransitive verbs?

There are two pretty consistent rules for transitive/intransitive verb pairs, one of which should help you here. When one verb rhymes with ある and the other verb rhymes with える, the verb rhyming with ある is intransitive and the verb rhyming with える is transitive. When one verb rhymes with える and the other verb ends in す, the verb rhyming with える is intransitive and the verb ending in す is transitive. With your specific example, rule 1 applies. So 集まる is intransitive and 集める is transitive.