tomorrow is sunday, or...

i)Tomorrow will be Sunday
or
ii)Tomorrow is Sunday
Both i and ii are correct. They are acceptable and used by westerners in daily life.
However, in school, (i) should be used instead of (ii).

I totally agreed with both of your opinions. Particularly 002.
A certain thing to happen in future does not require future tense stating.
So," tomorrow is Sunday" is correct.

2012-12-27 19:16:31 補充：
I mean 003

you should say Tomorrow is Sunday(明天星期天)




Tomorrow will be Sunday is tomorrow is a sunly day(明天會是晴天)

Tomorrow is Sunday. ~ correct

You are talking about a thing that is true at the time of speaking.
We use present simple to state a fact.

This year, Dec 24 is Monday, Dec 25 is Tuesday and Dec 26 is Wednesday.

2012-12-24 16:11:57 補充：
If Dec 23 is Saturday, Dec 24 is Sunday.
If today is Saturday, yesterday is Friday and tomorrow is Sunday.

1.Tomorrow is Sunday is more easier.

2.Tomorrow will be Sunday is more likely ENGLISH

You can say tomorrow will be Sunday!!

I would say, sunday will be tomorrow。