1, after oft, the verb prototype is used in the simple present tense:
I often go to the library on Sundays.
I often go to the library on Sundays.
2. Verb past tense followed by "oft" is used in the simple past tense:
I sometimes go to the park on weekends.
I used to go to the park sometimes on weekends.
Extended data
Regular usage
1, often basically means "often, often", mainly modifies verbs, and can also modify other adverbs or adjectives, indicating that something happens repeatedly on different occasions, and the specific time is of little significance.
Sometimes "often" also means "on many occasions". It can be used in general tense and perfect tense.
3. Often before the notional verb, but after the to be, modal verb or (first) auxiliary verb. Sometimes, for emphasis, it can also be placed before the copula, and the copula as a predicate should be emphasized.
4. It can often be put at the end of a sentence. If the sentence is quite short, you can put oft at the end of the sentence, and sometimes you can move it to the beginning of the sentence for emphasis or contrast, which often happens in verb inversion (not needed in informal style).
5. Used in interrogative or negative sentences. Often used as a predicative.
6. How 6.often does oft ask "how often" or "how many times"? Common phrases