How to form the simple present
Take the base verb. Use it as-is for I, you, we, they.
I work. You work. We work. They work.
For he, she, it, add 's' or 'es'.
He works. She works. It works.
Most verbs just add 's': eat → eats, walk → walks, read → reads.
Verbs ending in -ch, -sh, -ss, -x, -o add 'es': teach → teaches, wash → washes, kiss → kisses, fix → fixes, go → goes.
Verbs ending in consonant + y change y to ies: study → studies, try → tries, cry → cries.
Special: have → has (we saw this yesterday).