Teaching in this school / would certainly improve / if it had less boys / in all the high classes.

Teaching in this school
would certainly improve
if it had less boys
in all the high classes. E. No error

The correct answer is: E. No error.

The sentence is grammatically correct and does not contain any errors. The word “if” is used to introduce a condition, and the word “certainly” is used to emphasize the likelihood of the condition being met. The word “boys” is used to refer to male students, and the word “classes” is used to refer to groups of students who are taught together. The sentence is saying that teaching in this school would improve if there were fewer male students in all the high classes.

Here is a brief explanation of each option:

  • A. Teaching in this school: This is the subject of the sentence.
  • B. would certainly improve: This is the predicate of the sentence.
  • C. if it had less boys: This is a conditional clause.
  • D. in all the high classes: This is an adverbial phrase that modifies the conditional clause.
  • E. No error: This is the correct answer.
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