Can I say "Today is rainy"? "Today is rainy." and "It is rainy today." Can I use both?

sick in bed Can I use the phrase "sick in bed" if someone is in the hospital? or I can use it only the case if someone is in the bed of his/her house?) for example, is "He is sick in bed at the hospital." OK?

How to use "many" I am studying English grammar with a grammar book (written in Japanese), and I found the following explanation. == "many" or "much" is usually used in the negative sentence or the interrogative sentence. == Is it true? I often use "many" in affirmative sentences, like "I have many friends." or "There are many books in the library." Are these sentences awqward? Please help me.

What do you call my job in English? I work at home. I want to know what do you call my job in English. My job is correcting papers from school students. Once or twice a week, the correspondence education company send me students' papers to me. I correct them by the dead line, and return them to the company again. I mark ○ or ×　on the papers. If students made mistakes on their paper, I give some advice on the paper with a red pen. Also I score their papers. In Japanese, we call it "添削指導（てんさくしどう）" or "添削（てんさく". I always say like 「わたしは添削の仕事をしています。」 In English, how do you call this kind of job? Is "My job is cprrecting paper." make sence? Or do you have any particular name for this kind of job? Please help me.