Question

The quality of pens ___________ good. (is / are)

Answer 1

$\textbf {\underline {ANSWER:}}$

=>The quality of pens __(IS)_good.



WE USE HERE IS NOT ARE BCOZ QUALITY IS A SINGULAR.


NOTE:we use are in plural

We use "IS"for singular

Answer 2

The quality of pen is  good. { Present Indefinite Tense }