Steps of changing spelling from present to past tense
by Jean Baluyot
Verb tense, present, past, future, uses of 'will' in future and ING forms?
You can visit the English Verb Tenses section. It is a very good resource, full of explanations, examples and illustrations. It explains past, present, future, will and ING.
In addition, you can subscribe to the English Tenses Made Simple course. It includes 10 lessons that you will receive to your mailbox!