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.
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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.
.
_________________
Native English teacher at Mister Micawber's

[Nathanael86]

Hi,

wouldn't it be more precise to say "I'm fed up with all this mail..." instead of bored? You get bored of a movie that isn't as entertaining as you expected it to be for example. But unrequested mail is in my opinion rather annoying than boring.

[Bt_Unlock18]

can you please explain further why 'this mail' comes in plural form?
Is 'all' in the above sentence signifies the plural form of 'this mail' thanks!

[Mister Micawber]

'All' does not signify plural; it merely signifies a totality: all my beer is gone; all the cake has been eaten; all the beauty of the moment is past.
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Native English teacher at Mister Micawber's