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Many people are jealous of others success, but they do not realize that they are wasting their energy and time, they could be just as successful, if they start directing their energy toward work.
Hi, as a Brit & mentor, but not a teacher, I would suggest as follows:
Many people are jealous of other's success, but they don't realize (AmE, realise = UKE) that they are wasting their energy and time. They could be just as successful, if they start directing their energy toward work.
This works for me.
Regards NT
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