Simple Past Tense - Regular Verbs

The simple past form of regular verbs is simply formed by adding "ed" to the verb in simple form:
ADD + ED = ADDED

However, there are some spelling rules that have to be followed:
1. Verbs ending in "e" - only add "d" - example: ARRIVE - ARRIVED

2. Verbs ending in CONSONANT + "Y" - change the "Y" to "i" and add "ed"- CARRY - CARRIED

3. Verbs ending in CONSONANT+VOWEL+CONSONANT - double the last consonant and add "ed" - example: ADMIT - ADMITTED

For the simple present QUESTION and NEGATIVE forms, the helping verb forms are DO / DOES and DON'T / DOESN'T.

For the SIMPLE PAST TENSE only use DID and the verb in simple form (this is without "ED" 
Example : She doesn't work on Sundays (simple present)  She didn't work last Sunday (simple past).

Here is a link to a web page which provides a complete list of REGULAR VERBS IN ENGLISH:

 http://www.ompersonal.com.ar/omverbs/regularverbs.htm

(The infinitive form in the list is the same as the "simple form")

Here is an exercise, practice changing the sentences to past form, then check the answers:

Change the sentences to past form, use the word in parentheses.

1. Volcano eruptions burn the ecosystems around it. (last year)

2. The teacher asks questions for participation. (last Friday)

3. Does your sister study her lessons every afternoon? (last night)

4. Do you call your friends on the phone? (yesterday)

5. Victor chews gum in English class. (yesterday)

6. The children close the windows after class. (last week)

7. Your friends don’t compete for the best song. (last month)

8. The girl doesn’t cook dinner every night. (last night)

9. We don’t  check our exams. (yesterday)

10.  The parasites damage the hosts they live on. (in the experiment)

Copy it in a Word document, I will post the answers so you check your work!