This question checks your understanding of conditional conjunctions. The sentence talks about a situation that will succeed only on one condition—if everyone cooperates. Details Sentence: The plan will work only if everyone cooperates. Rule: Use if to express a condition that must be met for something to happen. Examples: You will pass if you study. The machine will start if you press the button. Why not others? unless = means if not (opposite meaning) although = shows contrast despite = used be

SHOULD in CONDITIONALS Using Should in a conditional In very formal English, should can replace if in a conditional sentence. The grammar is followed by a subject and verb - Should the screen freeze, try restarting the computer. This has the same meaning as, “If the screen freezes, try restarting the computer.” - Should you need any help, feel free to call me. - Should anyone call for Ms. Gilmour, I will let them know that she is in a meeting. - Should the flight take of late, I’ll call you Leav