Which sentence contains an error in the future-time form used after as long as or provided?
As long as the badge remains visible, security will admit you.
Provided the seedlings survive the frost, we can transplant them in April.
The engineer can finish tonight provided the replacement part will arrive by six.✓Richtige Antwort
We will lend you the trailer as long as you return it clean.
Erklärung
The replacement-part sentence is erroneous because will arrive appears inside the provided-clause. A present form belongs in that future condition, while the result clause carries the future meaning.