Question

Proofread the following article and correct its five subject-verb disagreements. 'This new technology is for everyone and will revolutionise the lives of millions of ordinary commuters. Cheaper than concrete or tarmac but just as durable, the new cycling paths absorbs light and re-emits it when they senses that it is required. They're one hundred percent environmentally-friendly.' The inventor, however, is less forthcoming when our conversation turns to how the product actually works. Despite a barrage of questions, the only thing he will admit to are that the key to this techno-wonder are a combination of recycled tyres (what else?) and a specially formulated light-emitting powder that charges during the day and glows at night.

Answer 1

A subject-verb agreement error occurs when the number (whether or not something is singular or plural) of the subject does not “agree” with the number of the verb.  For instance, if a subject is singular, the verb should be singular as well, and this is known as “agreeing.”  If the subject is singular, but the verb is plural, then this is known as a subject-verb agreement error (or subject-verb disagreement).  Below, the agreement errors have been corrected to the proper number and appear in bold. 

"This new technology is for everyone and will revolutionize the lives of millions of ordinary commuters. Cheaper than concrete or tarmac but just as durable, the new cycling paths absorb light and re-emit it when they sense that it is required. They're one hundred percent environmentally-friendly. The inventor, however, is less forthcoming when our conversation turns to how the product actually works. Despite a barrage of questions, the only thing he will admit to is that the key to this techno-wonder is a combination of recycled tires (what else?) and a specially formulated light-emitting powder that charges during the day and glows at night."