Questions & Answers about Er zal veel zijn veranderd in ons dorp.
How is the future perfect tense formed in this sentence?
It uses the future auxiliary zullen (conjugated here as zal) combined with the auxiliary zijn (to be) and the past participle veranderd (changed). Together, zal ... zijn veranderd means "will have changed".
Why is zijn used here instead of hebben for the perfect tense part?
Why does the sentence start with Er when the English translation doesn't say "There"?
Er acts as a temporary or "dummy" subject here. When the real subject of a sentence is a vague quantity like veel (much), Dutch often puts Er at the start of the sentence and shifts the real subject to a later position.