How do you know if a verb is regular or irregular in Spanish?

Related questions

1. What type of verb is Pensar?
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3. What are AR verbs in Spanish?
4. What are the 3 types of verbs in Spanish?
5. What are examples of irregular verbs in Spanish?
6. Is Dormir a irregular verb?
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9. What is a stem changing verb?
10. Is jugar an irregular verb?

Tags

1. #pattern
2. #these
3. #regular
4. #patterns
5. #tenses
6. #depending
7. #spelling
8. #verbs
9. #follows
10. #endings
11. #infinitive
12. #change
13. #other
14. #moods
15. #having
16. #follow
17. #forms
18. #irregular