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To the question, "Will you be having cake?" answering, "yes I will do" does not sound correct in AmE -- but it wouldn't surprise me coming out of the mouth of a British speaker (as related to some obscure but desperately vital grammar rule that we Americans have long neglected.)

Other than that, all of the rest are fine, and (without additional context) all mean the same thing.

Another option when refusing cake would be to say, "I can't," although usually you would explain why (I'm diabetic, I'm too full, I'm on a diet, etc.). Or you can be more emphatic, "I'd love some!" "Yes please!" or "For god's sake no! (I've had too many sweetsmuch sugar already this holiday season)"

There are far too many other possible responses to list, but these cover the basics.

To the question, "Will you be having cake?" answering, "yes I will do" does not sound correct in AmE -- but it wouldn't surprise me coming out of the mouth of a British speaker (as related to some obscure but desperately vital grammar rule that we Americans have long neglected.)

Other than that, all of the rest are fine, and (without additional context) all mean the same thing.

Another option when refusing cake would be to say, "I can't," although usually you would explain why (I'm diabetic, I'm too full, I'm on a diet, etc.). Or you can be more emphatic, "I'd love some!" "Yes please!" or "For god's sake no! (I've had too many sweets already this holiday season)"

There are far too many other possible responses to list, but these cover the basics.

To the question, "Will you be having cake?" answering, "yes I will do" does not sound correct in AmE -- but it wouldn't surprise me coming out of the mouth of a British speaker (as related to some obscure but desperately vital grammar rule that we Americans have long neglected.)

Other than that, all of the rest are fine, and (without additional context) all mean the same thing.

Another option when refusing cake would be to say, "I can't," although usually you would explain why (I'm diabetic, I'm too full, I'm on a diet, etc.). Or you can be more emphatic, "I'd love some!" "Yes please!" or "For god's sake no! (I've had too much sugar already this holiday season)"

There are far too many other possible responses to list, but these cover the basics.

1
source | link

To the question, "Will you be having cake?" answering, "yes I will do" does not sound correct in AmE -- but it wouldn't surprise me coming out of the mouth of a British speaker (as related to some obscure but desperately vital grammar rule that we Americans have long neglected.)

Other than that, all of the rest are fine, and (without additional context) all mean the same thing.

Another option when refusing cake would be to say, "I can't," although usually you would explain why (I'm diabetic, I'm too full, I'm on a diet, etc.). Or you can be more emphatic, "I'd love some!" "Yes please!" or "For god's sake no! (I've had too many sweets already this holiday season)"

There are far too many other possible responses to list, but these cover the basics.