1) Definitely じゃない. だない, as far as I know, doesn't exist. But there is also でない, which is a negation of the copula in special circumstances.
2) せかい
3) Both are right. あお is the noun; あおい is the adjective.
4) "You"
5) Eh, I'm not too sure, but there are some usage issues. It seems that officially (like for government purposes) 子供 is always used (like 子供手当て or 子供手当法) and means "children" or "child" more generally, but 子 is used more for specific people (この子は・・・) and for sexes (男の子・女の子) and maybe a few other things. But that's just a guess based on my experience. I've never really thought about it.
1.
1.
I am learning the negative forms now through guidetojapanese.org, but I have a question
In the lesson stood that "is not" can be translated as じゃない, but I always thought that the negative form of です is だない
So which of the two is right?
Maybe you feel that way because you hear lots of women (i.e., mothers) refer to their kids or other kids as 子 as in この子、あの子、その子 and so on? Given the same situations, men can refer to kids in the same way.
Additionally, older men/women can refer to younger people as 子 .
この子 , etc., is not necessarily restricted to the casual and the informal. It can be used in polite speech, depending on the situation (such as in business), I think.
Aside from the more general and abstract use of the word 子供 , as in 子供は純真だ , use of the word in reference to specific kids is usually emphatic, IMHO.
Online tutorials are great, but you really do need dictionaries to deal with reading and writing Japanese. Not to mention help in reading books, practicing on your own, and talking to people if you can.
Online tutorials are great, but you really do need dictionaries to deal with reading and writing Japanese. Not to mention help in reading books, practicing on your own, and talking to people if you can.
Jim Breen's JDIC is one of the best out there. It's Japanese-English. I cannot remember the exact URL, but a quick Google search will get you there.
To acquire a basic working knowledge of the language, it is very important that you have face to face interaction with fellow speakers. Once you do that and have a sound foundation, you can start to self-study.
Both Goo and Weblio have J-J, J-E, and E-J dictionaries. Weblio also has a 類語辞典 (thesaurus) and pulls from lots of Japanese specialty dictionaries and even 図鑑 in some cases, as well as Wikipedia.