Hi, a. If Mark hadn’t helped Brown, he wouldn’t have passed the exam. Correct.
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a. If Mark hadn’t helped Brown, he wouldn’t have passed the exam. Correct. Type III conditional sentence.
b. If Mark didn’t help Brown, he wouldn’t have passed the exam. Mixed conditional but incorrect as it is meaningless
However, the structure is grammatically correct, but it is meaningless. It indicates that passing exam in the past depended on the helping in present.Then, I'd like to know what you might think about "If it were not for his help, they would have failed".
pructusIf it were not for his help, they would have failed.Stative verbs are often seen in the simple past after if where the past perfect is expected. 'were' is a typical example, especially in the idiom "If it were not for ...". Still, "If it hadn't been for ..." is the "more correct" form for a situation in the past.
hrsanei but it is possible if the condition is continuous and true for present as well,If that's so, then in the example below..
pructusI heard that in the examples below, a. implies that he still doesn't own a car and b. doesn'tThe implication you label a. might occur to some people, but not to others. I had to think a while to understand what implicat
a. If he owned a car, he wouldn't have travelled on foot.
b. If he had owned a car, he wouldn't have travelled on foot