The authors experiment showed us that you should emphasize the importance as a good source
For the first the problem is the word “coffees”, correctly it would be just “coffee”.
The second is “glass” when it should be “glasses”
The third is “any pencils” when it should be “many pencils”
The forth is “aren’t” when it should be “isn’t”
And finally the fifth is “some” when it should be “any”.
I think its reliable narrator
