Agatha didn't have a happy marriage vs. Agatha isn't have...

[Tortilla]

English Grammar Tests, Elementary Level

ESL/EFL Test #103 "Agatha Christie test questions", question 2

Agatha Christie ......... have a happy marriage.

(a) wasn't
(b) didn't
(c) isn't

English Grammar Tests, Elementary Level

ESL/EFL Test #103 "Agatha Christie test questions", answer 2

Agatha Christie didn't have a happy marriage.

Correct answer: (b) didn't

Your answer was: incorrect
Agatha Christie isn't have a happy marriage.
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why i cant use isn't?

Tortilla

[Mister Micawber]

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Be is used in combination with other verbs only in the continuous aspect (Agatha Christie isn't having a happy marriage) and in the passive voice (Fun isn't often had by married men)
.
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Native English teacher at Mister Micawber's