Answer: “They should jog before they go to work.”
“I try to go to the gym whenever I can.”
“I am allowed to drive until sundown.”
Explanation: In the first case, "before they go to work" is the adverbial clause modifying the verb "jog"; in the second case, "whenever I can" is the adverbial clause modifying the verb phrase "go to the gym"; in the third case, "until sundown" is the adverbial phrase modifying the verb "drive."
