Explanation: Quickly it is a mode adverb and, in this case, indicates the way it goes. Fast is an adjective, but it can also be used as an adverb, with the same meaning as quick.
Both changed and started, the two verbs in this sentence, are regular verbs. regular verbs are verbs whose past tense is simply formed by adding -ed to the end of the word. so change is changed, and start is started. hope this helps (-:
