In Russian, many verbs belonging to the Second Conjugation (mostly ending in -ить or -еть) undergo a specific change called consonant mutation. This change is unique because it only occurs in the 1st person singular (я) form. For all other persons (ты, он, мы, вы, они), the stem consonant remains the same as in the infinitive.
The mutation typically involves adding an "л" after labial consonants or changing the sound of dental/sibilant consonants. Here are the most frequent patterns:
While т usually changes to ч, in certain verbs (especially perfective ones), it changes to щ:
прекратить (prekratítʹ - to cease/stop)
я прекращу́ (ya prekrashchú - I will stop), ты прекрати́шь (ty prekratíshʹ - you will stop)
Summary: Always check the stem of a second-conjugation verb when conjugating for "я". If it ends in one of these consonants, be prepared for a mutation that disappears in all other forms!
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