Conclusion

The past tense is formed by adding "ed" to the verb root. Depending on what the final letter is, different rules may apply

If a verb ends in a single vowel followed by a single consonant (VC), and the vowel has a strong stress, the final consonant is doubled before adding -ed

Example:

step + p + ed = stepped

If the verb ends in two vowels and a consonant (VVC), or one vowel and two consonants (VCC), we do not double the final consonant.

Example:

roar + ed = roared

In the case of verbs that end in -e, we only add -d to form the past tense

Example:

tame + d = tamed

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