Had he been more attentive in class, he would have understood the lecture better and wouldn't be struggling with the assignments now.
ERROR :  CORRECTION: 

The proposal, that was discussed during the meeting with the board members, was eventually approved despite several objections.
ERROR :  CORRECTION: 

Every student in the debate team, regardless of their experience or skill level, were given an opportunity to speak.
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If I was in your place, I would reconsider accepting that offer without reading the terms carefully.
ERROR :  CORRECTION: 

The CEO, along with the department heads, have agreed to revise the policy to address the employees’ concerns.
ERROR :  CORRECTION: 

The book, which he had borrowed from the library and forgotten to return, have now been listed as missing.
ERROR :  CORRECTION: 

Not only she missed the deadline, but she also failed to inform her supervisor about the delay.
ERROR :  CORRECTION: 

Each of the candidates were asked to present their ideas clearly and confidently to the panel of judges.
ERROR :  CORRECTION: 

Despite of being one of the most intelligent students in class, she often doubted her own abilities.
ERROR :  CORRECTION: