forgot vs forget

[Kinn]

English Language Tests, Intermediate level

ESL/EFL Test #259 "Irregular Verbs Test (7)", question 2

I know I have to get my oil changed but I ......... to do it today.

(a) forget
(b) forgot
(c) forgotten

English Language Tests, Intermediate level

ESL/EFL Test #259 "Irregular Verbs Test (7)", answer 2

I know I have to get my oil changed but I forgot to do it today.

Correct answer: (b) forgot
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i little bit confusion between forget and forgot?

Kinn

[Mister Micawber]

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'Forgot' is past; 'forget' is timeless present.
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Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mister Micawber