What are the rules of regular verb?

Answer 1

Rule #1 If the base form of the verb ends with a consonant except -y add -ed; example:

call - called

shout - shouted

Rule #2 If the base form of the verb ends with vowel -e add -d; example:

create - created

place - placed

Rule #3 If the base form of the verb ends in -y and -y is preceded by a consonant change -y to -i and add -ed; example:

marry - married

study - studied

Rule #4 If the base form of the verb ends in - y and -y is preceded by a vowel add -ed; example:

play - played

sway - swayed

Rule #5 If the verb spelled with a single vowel letter and followed by a single consonant letter double the consonant and add -ed; example:

prefer - preferred

occur - occurred