Exercício: Correção de frase em inglês

"I'm sure they didn't took English in high school."

Boa dia/tarde/noite!
Gostaria de saber o item incorreto da frase.
Valeu!
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Avatar do usuário Joarez.GN 555 1 10
A frase correta seria,

"I'm sure (that) they didn't take English classes in high school."

Cheers!
Avatar do usuário PPAULO 37630 6 31 659
And that´s why:

With a negative sentence in which you use "did not/didn´t" it means that the (main) verb doesn´t conjugate as we learn in basic English (when we learn verb to be/to have, for example). The verb don´t go the past form.
The "did not/didn´t" simply "kills" the conjugation, and then the verb works in its infinitive form (present infinitive form, some people would say).

Say, by way of examples: take continues as take/work as work/give as give. And so on...

Back to your initial sentence then:
"I'm sure they didn't took English in high school." The verb is not correctly used, it should be "I'm sure they didn't take English in high school."