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Questions & Answers about Я часто ошибаюсь.
Why does ошибаюсь end in -сь instead of -ся?
This is a reflexive verb. When you conjugate it for Я (I), the normal verb ending is -ю. Because ю is a vowel, the reflexive part shortens from -ся to -сь to make it easier to say. If the verb ended in a consonant, it would stay -ся.
The English translation says "am mistaken." Why is there no word for "am" in the Russian sentence?
In Russian, being mistaken is expressed with an action verb: ошибаться (to make a mistake / to be wrong). The sentence literally translates to "I often make mistakes." You don't need a "to be" verb like "am" because ошибаюсь is an action you are doing.
How would I change this to say "I am never mistaken", using the double negatives from this lesson?
You would use the word никогда (never) and remember to add не (not) right before the verb. It becomes: Я никогда не ошибаюсь. Russian requires this double negative, so you literally say "I never not make mistakes."
Can I put часто at the very end of the sentence?
You can, but it changes the focus. In Russian, the most important or new information usually goes at the end of the sentence. Saying Я ошибаюсь часто strongly emphasizes the frequency ("I make mistakes OFTEN"). Putting часто before the verb, like in this sentence, is the most natural and neutral word order.