* Subject-verb agreement: The sentence has multiple subjects ("I", "he") but only one verb ("am"). English requires verbs to agree with their subjects in number.
* Word order: The sentence doesn't follow the typical subject-verb-object structure of English sentences.
Here are some ways to correct the sentence, depending on what you want to say:
* To express agreement: "I am, too." or "He is, too."
* To emphasize both subjects: "He and I are." or "I and he are."
* To indicate similarity: "I am like him." or "He is like me."
The correct way to express your intended meaning will depend on the specific context.