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Sentence Correction: Pronoun Questions - It

Unlike birds, which are highly sensitive to atmospheric pressure, people have found that paragliding require the use of a variometer since detecting thermal currents are impossible using normal human motion sensitivity.

Incorrect.

This answer choice is grammatically incorrect. It contains two Subject Verb Agreement mistakes.

The first mistake is that the singular subject paragliding does not agree with the plural verb require.

The second mistake is that the singular subject detecting does not agree with the plural verb are.

Remember that a subject in the form of To Verb or Verb+ing is considered a singular subject.

You're right!

This answer choice corrects both original Subject Verb Agreement mistakes, by changing the sentence structure and eliminating the relative clause that paragliding require, etc..

In the original sentence, the first mistake was that the singular subject paragliding did not agree with the plural verb require. In the corrected sentence this construction is replaced by an object phrase [have found] the use of a variometer crucial for paragliding.

The second mistake was that the singular subject detecting did not agree with the plural verb are. By eliminating the original subject (detecting) and creating a new clause in which the pronoun it serves as a subject replacement ("it is impossible to detect") the original Subject Verb Agreement issue is eliminated.

Remember that a subject in the form of To Verb or Verb+ing is considered a singular subject.

Incorrect.

This answer choice corrects one of the original Subject verb Agreement mistakes by replacing the plural verb require with the singular requires

However, it repeats the other original Subject Verb Agreement mistake: the singular subject detecting does not agree with the plural verb are.

Remember that a subject in the form of To Verb or Verb+ing is considered a singular subject.

Incorrect.

Although this answer choice corrects both original Subject Verb Agreement mistakes, it is stylistically flawed. Redundancy is created by replacing the single word since with the five-word phrase due to the fact that; replacing the single word impossible with the two-word phrase not possible; and replacing the single word using with the four-word phrase with the use of.

Incorrect.

Although this answer choice corrects both original Subject Verb Agreement mistakes, it changes the meaning of the original sentence. Changing the word detecting to detected turns the word currents into the subject whereas in the original sentence the subject was detecting.

Also, the original sentence does not concern the handling of thermal currents; it concerns their detection.

that paragliding require the use of a variometer since detecting thermal currents are impossible using normal human motion sensitivity
the use of a variometer crucial for paragliding since it is impossible to detect thermal currents using normal human motion sensitivity
that paragliding requires the use of a variometer since detecting thermal currents are impossible using normal human motion sensitivity
paragliding to require the use of a variometer due to the fact that detecting thermal currents is not possible with the use of normal human motion sensitivity
that paragliding requires the use of a variometer since detected thermal currents are impossible to handle using normal human motion sensitivity