100
In Spanish, regular -ar verbs are conjugated with -é, -aste, -ó, -amos, -aron and -er and -ir verbs are conjugated with -í, -iste, -ió, -imos, -ieron. In English, regular past tense verbs are formulated with verb+ed.
Compare the endings of past tense verbs in Spanish as opposed to past tense verbs in English.