Drop the initial verb ending (-ar, -er or -ir), leaving the verb with just the stem. For example, "correr" ("to run") will become "corr."
Attach the appropriate suffix to the end of the verb. Verbs that initially end in -ar will only attach to an ending that starts with the letter "a." -Er and -ir verbs typically follow the same pattern. These endings are essentially the same as adding -ing to an English phrase. Many -ir verbs will change the root stem; for example, "dorm" (of "dormir") will become "durm." Irregular verbs require specialized changes unique to the verb.
The endings are as follows:
-ante
-ente
-iente
Place the newly transfigured verb behind the noun. For example, "running water" is expressed as "el agua corriente."