What are the rules for adding ed to a verb?

We add -ed to a verb to make the past and past participle forms. This is true for regular verbs.

eg wait -- waited, ask --- asked

If the Word ends in -e then just add -d eg love -- loved

If the Word ends in single vowel + consonant then double the consonant eg rub -- rubbed, stop -- stopped

If the Word is 2 or 3 syllables and the stress is on the last syllable then double the final consonant eg occur -- occured, admit -- admitted

If the Word is 2 or 3 syllables and the stress is on the first syllable then don't double the final consonant eg enter -- entered, develop -- developed

If the Word ends in -y then the -y changes to i then add -ed. eg cry -- cried, carry -- carried