mails vs mail

[Rodriges]

English Grammar Error, Intermediate level

ESL/EFL Test #22 "Gerunds and Idioms", question 10

I'm really boring with all this mail that comes through my door asking me to give money to this or that charity.

(a) boring
(b) this mail
(c) asking

English Grammar Error, Intermediate level

ESL/EFL Test #22 "Gerunds and Idioms", answer 10

I'm really bored with all this mail that comes through my door asking me to give money to this or that charity.

Correct entry: bored
The error was: (a) boring

You have not found the error.
I'm really boring with all these mails that comes through my door asking me to give money to this or that charity.
_________________________

why all this mail in singular form?

Rodriges

[Conchita]

'Mail' is in the singular when it refers to the letters delivered by post.

[Mister Micawber]

.
And it is uncountable: I didn't get much mail today.
.
_________________
Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mister Micawber