The document summarizes the pronunciation rules for regular verb endings in the past simple tense. It explains that verbs ending in unvoiced consonants like -t, -k, -s add -ed as /t/, verbs ending in -t or -d add -ed as /Id/, and verbs ending in voiced consonants add -ed as /d/. It then provides examples checking the pronunciation of -ed for different verbs in the past simple tense.