1. He is not our age.
2. He is not of our age.
(Does #1 come from #2? Is 'of' omitted in Sentence 1?)
3. Who is a math genius?
4. Hana is.
5. Hana is a math genius.
6. It is Hana.
7. She is Hana.
(Which ones are the answers to the question, #3?)
1 is correct; 2 is not, unless you mean that he and we don't live in the same era!
3 - 6 are correct; 7 is grammatically correct, but very awkward and not used.
1. The first sentence "He is not our age." does not necessarily come from the second sentence "He is not of our age." In these sentences, the word "of" is not omitted in the first sentence. Rather, the two sentences have slightly different structures and meanings.
2. In sentence 1, it simply states that "He is not our age," indicating that the person referred to is not the same age as the speaker or the group being referred to. It does not provide further information about the person's age.
3. In sentence 2, "He is not of our age," the preposition "of" is used to indicate belonging or being a part of something. Here, it suggests that the person referred to does not belong to the same age group as the speaker or the group being referred to.
Regarding the second set of sentences:
3. The question "Who is a math genius?" is directly asking for a person who possesses the characteristic of being a math genius.
4. The sentence "Hana is." simply gives a concise answer to the question by stating that Hana is the math genius being asked about.
5. The sentence "Hana is a math genius." provides a complete answer to the question by stating that Hana possesses the characteristic of being a math genius.
6. The sentence "It is Hana." does not directly answer the question, as "It" is not a clear reference to Hana being a math genius. Therefore, this sentence is not an answer to the question.
7. The sentence "She is Hana." also does not directly answer the question, as it does not state the specific characteristic of being a math genius. Though it refers to Hana, it does not provide the information requested in the question. Hence, this sentence is not an answer to the question either.
In summary, sentences 4 and 5 are the answers to the question "Who is a math genius?"