Learn Dutch: Gerepareerd heb ik de trapper al. - I already repaired the pedal.

This is an example of fronting for contrastive focus. By putting Gerepareerd first, the speaker emphasizes the specific action of repairing. It strongly implies a

How does fronting Gerepareerd affect the position of the helping verb?

Dutch main clauses strictly follow the V2 (verb-second) rule. Since the past participle Gerepareerd takes up the first position in the sentence, the conjugated helping verb heb must take the second position. This pushes the subject ik into the third position, resulting in inversion (heb ik).

In a normal sentence, the object goes before the past participle. Why doesn't de trapper go with Gerepareerd at the front?

When we front a verb for focus, we generally only move the verb itself, not its object. The rest of the sentence continues as a normal inverted clause: conjugated verb (heb), subject (ik), object (de trapper), and finally the adverb (al). Trying to front the object alongside the participle would violate the strict V2 rule by placing multiple distinct elements before the conjugated verb.

Why is the adverb al at the very end of the sentence?