How do you form the past tense of verbs ending in 'o'?

To form the past tense of verbs ending in 'o', there are a few different rules to consider depending on the specific verb. Here are the main guidelines:

1. For regular verbs ending in 'o', you typically add '-ed' to the base form of the verb. For example:
- Work (base form) becomes worked (past tense)
- Play (base form) becomes played (past tense)
- Follow (base form) becomes followed (past tense)

2. For irregular verbs ending in 'o', the past tense form can vary. Some common irregular verbs ending in 'o' include:
- Go (base form) becomes went (past tense)
- Do (base form) becomes did (past tense)
- Have (base form) becomes had (past tense)

3. For verbs ending in 'o' preceded by a consonant, you usually just add '-ed' to form the past tense. For example:
- Echo (base form) becomes echoed (past tense)
- Hero (base form) becomes heroed (past tense)

4. For verbs ending in 'o' preceded by a vowel, you typically add '-ed' as well, but you may need to double the final consonant before adding the '-ed'. This is to maintain the pronunciation of the word. For example:
- Woo (base form) becomes wooed (past tense)
- Boo (base form) becomes booed (past tense)
- Glow (base form) becomes glowed (past tense)

It is important to note that there are exceptions and irregularities in the English language, so it is always a good idea to consult a reliable dictionary or grammar resource for specific verbs that may not follow these general rules.