Today, it is hard snowsnowed hard. Today, it snowed hard.

Today, ithere is hardeavy snow. Today, there is heavy snow.

You could also say "Today it is snowing hard" or "Today it is snowing heavily".

I have such abeen so busy since last week. I have been so busy since last week.

Or maybe you mean "I have been so busy this past week." ?

I have such awas so busy in last week. I was so busy last week.

I haveam tired. I am tired.

I have'm tired. I'm tired.

I think Ssleeping is importancet. I think sleeping is important.

I think Ssleeping is importancet. I think sleeping is important.