About 40 percent of those killed in bygone accidents would have been saved if wearing safety belts.
Is the usage acceptable?
anonymous Is the usage acceptable? No. Not to my ear.
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anonymousIs the usage acceptable?
No. Not to my ear. Write out the full thought, thus:
... would have been saved if they had been wearing safety belts.
CJ
You can use the -ing form after prepositions. "If" is not a preposition.
By wearing a seat belt, you might just be saving your own life.