Usage of shoes, slippers

[Kiki]

Sir, am i right if i say shoes are plural. Never say " shoe" because we wear them in two our feet, right

So if i make in sentence we have to use to be "are" or "is"

The shoes are black.

or

The shoes is black.

(because shoes have function if there are two, right) but i really need your explanation sir)

[Mister Micawber]

'The shoes are black', or 'the shoe is black' (if you can only find one of them).
.
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Native English teacher at Mister Micawber's