Breakdown of Я режу медленно, потому что боюсь порезаться.
я
I
медленно
slowly
потому что
because
резать
to cut
бояться
to be afraid
порезаться
to cut oneself
Questions & Answers about Я режу медленно, потому что боюсь порезаться.
Why do we use the perfective verb порезаться after боюсь (I am afraid)?
When you are expressing fear of, or warning against, an accidental negative event, you use the perfective aspect. You aren't afraid of the continuous process of cutting; you are afraid of the sudden, one-time result of making a mistake. This uses the exact same logic as the negative warnings in this lesson, such as Смотри, не порежься! (Watch out, don't cut yourself!).
What would it mean if I used the imperfective резаться instead?
Using the imperfective here would sound very strange. It would imply you are afraid of the ongoing, deliberate process of cutting yourself. By using the perfective порезаться, you make it clear that you are afraid of accidentally completing the action.
Why is there a ж in режу but a з in порезаться?
The base verb is резать (to cut), which has a з in the infinitive. However, it undergoes a regular consonant mutation when conjugated in the present tense: the з changes to ж for all persons (я режу, ты режешь, etc.). Because порезаться is in the infinitive form, it keeps the original з.
Both боюсь and порезаться are reflexive verbs. Why does one end in -сь and the other in -ся?
This is a quick spelling rule for reflexive verbs: the ending depends on the letter that comes right before it. If the verb form ends in a vowel (like the ю in бою-), you attach -сь. If it ends in a consonant or a soft sign (like the ть in порезать-), you attach -ся.
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