1. His method is simpler than the previous method.

Question

1-2. His rule is much simpler than Ted's
rule.

2. He is more active than Tom.
2-2. The girl is more lovable than Emily.
2-3. He is more tiresome than the boss.
2-4. He is tiresomer than the boss.

3. He is the wisest boy of all the boys.
4. He is the tallest man in the village.
(Are they all grammatical?)

5. He is handsomer than David.
6. He is more handsome than David.
(Are both grammatical? Which one is commonly used?)

Answer 1

2-4 is not good. 2-3 is correct.

6 is better than 5.

All others are fine.