posted by Amy~ .
For the verb componer in the present tu form is Compone. But in the preterito it's compuso.
Is the ending -puso because the verb as poner in it which is irregular?
Also, would this be the case for all verbs that have endings that are irregular?
Yes for verbs ending with poner, but compone/compuso is not the tu' form of the verb. It goes with Ud./el/ella.
I can't say for certain if the same rule applied to all irregular verbs with identical endings.
SraJMcGin may post an answer to that later.
Yes, the verb componer follows the pattern for poner, exactly, just with the prefix "com" there.
poner = pongo, pones, pone, ponemos, ponéis, ponen
compouer = compongo, compones, compone, componemos, componéis, componen
poner = puse, pusiste, puso, pusimos, pusisteis, pusieron
componer = compuse, compusiste, compuso, compusimos, compusisteis, compusieron