"..., can she?" vs "..., can't she?"

[Dionisius]

English Language Tests, Intermediate level

ESL/EFL Test #238 "Question Tags Test (1)", question 1

Laurie can come by tomorrow, .........?

(a) can she
(b) can't she
(c) is she

English Language Tests, Intermediate level

ESL/EFL Test #238 "Question Tags Test (1)", answer 1

Laurie can come by tomorrow, can't she?

Correct answer: (b) can't she
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Why not "can she"?

Dionisius

[Alan]

Hi,

In this sort of sentence with a question tag where the speaker wants affirmation, it's negative followed by postive and positive followed by negative as in:

You don't know, do you?
You know, don't you?

A
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