Answer :
1. **Simple Present Tense**: "He sings melodiously."
- Uses the base form of the verb ("sing") with "s" added for third person singular ("sings").
2. **Present Continuous Tense**: "He is singing melodiously."
- Uses the present participle form of the verb ("singing") with the auxiliary verb "is".
3. **Present Perfect Tense**: "He has sung melodiously."
- Uses the past participle form of the verb ("sung") with the auxiliary verb "has".
4. **Present Perfect Continuous Tense**: "He has been singing melodiously."
- Uses the present participle form of the verb ("singing") with the auxiliary verb "has been".
5. **Simple Past Tense**: "He sang melodiously."
- Uses the past tense form of the verb ("sang").
6. **Past Continuous Tense**: "He was singing melodiously."
- Uses the past participle form of the verb ("singing") with the auxiliary verb "was".
7. **Past Perfect Tense**: "He had sung melodiously."
- Uses the past participle form of the verb ("sung") with the auxiliary verb "had".
8. **Past Perfect Continuous Tense**: "He had been singing melodiously."
- Uses the past participle form of the verb ("singing") with the auxiliary verb "had been".
9. **Simple Future Tense**: "He will sing melodiously."
- Uses the base form of the verb ("sing") with the modal auxiliary verb "will".
10. **Future Continuous Tense**: "He will be singing melodiously."
- Uses the present participle form of the verb ("singing") with the modal auxiliary verb "will be".
11. **Future Perfect Tense**: "He will have sung melodiously."
- Uses the past participle form of the verb ("sung") with the modal auxiliary verb "will have".
12. **Future Perfect Continuous Tense**: "He will have been singing melodiously."
- Uses the present participle form of the verb ("singing") with the modal auxiliary verb "will have been".