I would like to use this sentence in a situation where swimmers need to be observed by a life saver for safety reasons.
Swimmers are required ensure the presence of a life saver.
Is that grammatically correct?
No, its nonsense. Your introductory sentence makes more sense: Swimmers need to be observed by a life saver for safety reasons.
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No, its nonsense. Your introductory sentence makes more sense:
Swimmers need to be observed by a life saver for safety reasons.
moguwai007Swimmers are required to ensure the presence of a life saver.
I think I'd say
Before going into the water, swimmers should ensure that there is a lifeguard on duty.
CJ