In Spanish, certain verbs require spelling adjustments in the present tense to maintain the correct pronunciation. These changes occur only in the first person singular (yo) form. This happens because the vowel "o" in the ending can change the sound of the consonant that comes before it.
In Spanish, the letter G sounds like an English "H" when followed by e or i (as in gente or gigante). However, before a, o, or u, it has a hard sound (like "gate").
To keep the original soft sound (like the "H" sound) in the yo form, we must change the g to a j before the ending –o.
For these verbs, the u is silent in the infinitive; it is just there to make the g hard (like "guitar"). Since g is naturally hard before –o, the "u" is no longer necessary.
Therefore, we drop the u and change gu → g.
When a verb ends in –cer or –cir and is preceded by a consonant, the soft "th" sound (in Spain) must be preserved. The letter c sounds like "k" before –o, so we must change it.
We change c → z in the yo form.
Some verbs combine these spelling rules with vowel stem changes (like e → i or o → ue).
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