Some Spanish verbs evolved from Latin in such a way that they are termed "irregular". There are various categories of irregular verbs, one of which is the category of verbs with irregular 1st person, or YO. Certain irregular yo verbs end in a "GO", thus I term them "Go verbs". Common "Go verbs" include examples such as the following: tener, venir, and decir. What is especially odd with these verbs is that they are a combination of "go verb" and stem change verb.
Te begin the conjugation of Tener and Venir, do as always-drop the endings and you are left with Ten and Ven. Add the GO and you have the irregular yo as tengo and vengo. Both of these verbs are e-ie stem change verbs so the rest of the conjugations (except for nosotros and vosotros, of course) will have the IE in place of the E. Thus, these two verbs will conjugate:
Decir is a go verb combined with an E-I stem change and so it conjugates:
In the exercise that follows, link the subject up with the correct conjugation