Question:

Which 2 answers are correct? Which is not and why?

1. Sorry, I can't. I'm seeing my grandmother.
2.Sorry, I can't. I'm going to see my grandmother.
3. Sorry, I can't. I'll see my grandmother.

1 and 2 are correct.

# 3 doesn't explain why you can't.

so the problem is the tense or?

To determine which of the three answers are correct and which one is not, we need to analyze the sentences and their structure.

1. "Sorry, I can't. I'm seeing my grandmother."
2. "Sorry, I can't. I'm going to see my grandmother."
3. "Sorry, I can't. I'll see my grandmother."

All three responses express an inability to do something because the person is going to see their grandmother. However, there is a subtle difference in the wording and usage.

Answer 1 uses the present continuous tense: "I'm seeing my grandmother." The present continuous tense is commonly used to describe actions happening at the moment of speaking or actions happening in the near future that have already been arranged or planned. Therefore, this answer suggests that the person is currently seeing their grandmother or is going to see their grandmother in the very near future.

Answer 2 uses the structure "I'm going to see my grandmother." This structure implies a future plan or intention. It indicates that the person has already made plans to see their grandmother.

Answer 3 uses the modal verb "will" with "I'll see my grandmother." This structure also indicates a future action. "Will" expresses a voluntary action or a promise to do something.

Based on these explanations, both answer 1 and answer 2 can be considered correct because they express a future action of seeing the grandmother. However, answer 3 is technically incorrect because it suggests a voluntary action or promise to see the grandmother, rather than a previously arranged plan.

Therefore, the correct answers are:

1. Sorry, I can't. I'm seeing my grandmother.
2. Sorry, I can't. I'm going to see my grandmother.

Answer 3 is not correct because it does not align with the context of the question, which implies a prearranged meeting or visit with the grandmother.