When we use the helping verb 'do', we need the base from of verb

[Dianka]

English Grammar Error, Intermediate level

ESL/EFL Test #23 "Expressions and Gerunds", question 2

Do you know what the cat bought in for me today? Yes, that's right another dead mouse.

(a) Do
(b) bought in
(c) another

English Grammar Error, Intermediate level

ESL/EFL Test #23 "Expressions and Gerunds", answer 2

Do you know what the cat brought in for me today? Yes, that's right another dead mouse.

Correct entry: brought in
The error was: (b) bought in
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i think the error of this sentence is "b",isn't it?
because when we use the helping verb "do" we need the base from of verb, right?

Dianka

[Mister Micawber]

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No. Here, 'do' is the auxiliary for 'know'. This is a vocabulary test question: the sentence reads 'bought' (past tense of 'buy'), but the correct word is 'brought' (past tense of 'bring').
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Native English teacher at Mister Micawber's

[Mister Micawber]

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I didn't answer your questions clearly, Dianka: Yes, with the operator 'do', we use the base form of the main verb. However, that is not the error in this question.
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Native English teacher at Mister Micawber's