ungrammatical

"He gave an incorrect answer to a simple question."

"The convention was held in Geneva."

"My teacher explained the new math concept, and I understood it perfectly. "

"The lack of sleep resulted in a poor performance on the math test. "

"Deaf and mute people communicate using languages like ASL."

"Late arrival to class is an unacceptable reason for missing the test. "

"The box contained old photographs. "

"The court returned a sentence of guilt in the first charge, but innocence in the second."

"My argument for staying late was that I needed extra time to finish my project. "

"the defining power of an optical instrument"

"The complicated instructions on the new software difficult me from completing the project on time. "

"The student's late arrival was a violation of school policy. "