Dog is now a good boy.

Meaning: This sentence describes the dog's current state of being considered well-behaved and obedient.

Choice of Words: Good means morally right or acceptable. Boy is a young male child.

Alternative Expressions

The dog has become a good boy.

Meaning: This sentence means that the dog has started behaving well.

Choice of Words: **Dog** is the name of the animal we are talking about. **Has become** is a verb that shows that the dog has changed into something. **Good** means that the dog is behaving well. **Boy** is a word we use to refer to a male dog.

The dog is finally a good boy.

Meaning: This sentence means that the dog has taken a long time to start behaving well.

Choice of Words: **Dog** is the name of the animal we are talking about. **Is** is a verb that shows that the dog is something. **Finally** means that something has happened after a long time. **Good** means that the dog is behaving well. **Boy** is a word we use to refer to a male dog.

Related Expressions