With regular verbs, the past tense is formed (in terms of spelling) by adding "-ed" to the base form ("play" → "played"). Normal rules for adding suffixes beginning with a vowel apply: If the base form ends in "e" then only "d" is added ("like" → "liked"); if the base form ends in a consonant followed by "y" then the "y" is changed to "i" before adding the ending ("try" → "tried"; an exception is the verb "" (a ball), which can form "skied" or "skyed").