You have to know all forms of the irregular verbs very well. For the Simple Past you need the form of the verb which can be found in the 2nd column of the table of the irregular verbs.
go - went - gone
Add -with regular verbs.
|infinitive + -|
Sometimes the are exceptions in spelling when adding -ed.
Double the consonant.
stop – sto
swap - swa
If the consonant is not stressed, we do not double it:
benefit - benefit (Here we stress the first 'e', not the 'i'.) In British English we double one -l at the end of the word:
travel - trave
Add only -d.
lov – lov
sav – sav
verbs ending in 'y' preceded by a vowel (a, e, i, o, u): Add -ed.
I play - he play
verbs ending in 'y' preceded by a consonant: Change 'y' to 'i' Then add -ed.
I hurry - he hurr
|2nd column of the table of the irregular verbs|