Two very easy questions:

1 - I want to reply "NEC's Computer" as in "a computer manufactured/made by NEC", is it ok to do use the 'no' particle to indicate that?

A:　これは、なんですか。
B:　NECのパソコンです。

2 - If I'm talking about some noun that was already mentioned in the conversation, is it valid to follow up with the particle+main noun (bold part) omitted in this example?

A: これわ、どこのかさですか。
B: それわ、日本のかさです。
A: だれのかさですか。
B: 私のかさです。

1. Yes, it's ok to use の in that fashion.  

2. 
A: これわは、どこのかさですか。
B: それわは、日本のかさです。
A: だれのかさですか。
B: 私のかさです。

Yes, this conversation could also go as:
A: これは、どこのかさですか。
B: それは、日本のかさです。
A: だれのですか。
B: 私のです。

It's easy to forget you have to type "ha" for Microsoft IME even though you read it as "wa"...

Thanks, just to make sure I understood you, you can do both:


A: だれのですか。
B: 私のです。

and

A: だれですか。
B: 私です。

right? Thanks again!

For the second part, let me emphasize from RandomQuotes' post that の was left in the sentences.

RandomQuotes Wrote:A: だれのですか。
B: 私のです。

Think of it kind of like saying "Who's is it?" instead of "Who's <thing> is it?"; you don't leave out the possessive bit, just the part that's known.

Got it now, thanks RandomQuotes and sholum for the help.

Apropos of nothing I'll just leave this here
http://www.bristol.ac.uk/arts/exercises/...age_57.htm

(2016-01-24, 6:25 am)anotherjohn Wrote: Apropos of nothing I'll just leave this here
http://www.bristol.ac.uk/arts/exercises/...age_57.htm

Here's john555's way of putting it:

"Whose" is the genitive of "who"

"Who's" is a contraction of either "who is" or "who has".

(2016-01-24, 6:59 am)john555 Wrote:

(2016-01-24, 6:25 am)anotherjohn Wrote: Apropos of nothing I'll just leave this here
http://www.bristol.ac.uk/arts/exercises/...age_57.htm

Here's john555's way of putting it:

"Whose" is the genitive of "who"

"Who's" is a contraction of either "who is" or "who has".

Aside from the slightly "AHAHA YOU'RE DUMB" tone thanks anotherjohn, and thanks john555. I'm not a native speaker of english but I really have no excuse to not know the difference between whose and who's. Nice hint.

Anyway, think I got it now:
だれですか。 Who is it?
だれのですか。Whose is it?
それは、だれのパソコンですか。 Whose computer is that one?
私のです。It is mine.

Thanks everyone.

(2016-01-24, 12:14 pm)Arino Wrote: Anyway, think I got it now:
だれですか。 Who is it?
だれのですか。Whose is it?
それは、だれのパソコンですか。 Whose computer is that one?
私のです。It is mine.

Thanks everyone.

These are all correct, yes.

(2016-01-24, 6:25 am)anotherjohn Wrote: Apropos of nothing I'll just leave this here
http://www.bristol.ac.uk/arts/exercises/...age_57.htm

*facepalm*
My excuse: I was tired...