So let's start with das. Normally, it's just an article for neuter words, like "das Auto". But if you use it without any noun it refers to, it becomes a demonstrative pronoun:
Das Auto ist schön - the car is nice. Das ist schön - this is nice.
Since it doesn't refer to anything in particular, it doesn't get any flection. Whatever you currently do or see or experience, it is nice.
Now if you want to talk about a specific noun and use a demonstrative like "this car", you use dieses. Since it refers to a noun which has a gender and also a case, you have to decline it according to the noun:
This car is nice - dieses Auto ist schön. (nominative sg neuter)
This dog is dangerous - dieser Hund ist gefährlich. (nominative sg masc.)
This cat is black - diese Katze ist schwarz. (nominative sg. fem)
These children are loud - diese Kinder sind laut. (nominative pl)
I like this dog - ich mag diesen Hund (accussative sg. masc.)
and so on. You can look the tables up. You can actually drop the noun here, but you still match the pronoun to the item you refer to:
Dieser Ring gefällt mir - I like this ring.
Dieser gefällt mir - I like this one.
You mean a specific noun without naming the noun, so this one is a pretty good translation in my opinion. Compare to unspecific "I like this" - "ich mag das".
So far is what you would probably use in writing. In speech, you sometimes use the article as a demonstrative, but then it gets a flection, too. You have to lay heavy emphasis on the article to convey that you use it as demonstrative pronoun:
Der Hund ist gefährlich - the dog is dangerous.
Der Hund ist gefährlich - this dog is dangerous.
again, you can drop the noun but keep the declinated form and the emphasis:
Der ist gefährlich - this one is dangerous.
At last, we have dies without any ending. You can use it the same way you used das as a demonstrative in the example above:
Das ist schön - this is nice. Dies ist schön - this is nice.
It sounds a little more stilted. You would mostly hear it while someone points a finger and explains something, but using das is correct then as well, so you can easily live without dies.
There are some more obscure demonstrative pronouns in german, like the aforementioned jener, derjenige, derselbe and solcher, but you don't need to worry about them for now.
I dont understand this demonstrative nominative accusitive language you are using. You guys seem to be professional learners who researched deep into how languages work and that seems to make understanding and learning languages much easier and faster for you. I'm sadly just a filthy casual and this doesn't help much at all haha
Don't expect to hear German words pronounced in your accent of English. A German would never pronounce it 'dieserrr' with what you might consider to be the 'real R sound'. The German r sounds different depending on where it is in the word anyway.
In dieser, the final sound is more like a vowel, but a different vowel to diese. Listen to recordings by native-speakers, for example on Forvo (diese, dieser). Sometimes the Forvo page also has the transcription in IPA if you are familiar with it. You can also find this in dictionaries and on Pons.
I think because Mann is masculine hence we need to use dieser. Look at this link http://www.vistawide.com/german/grammar/german_cases.htm
My point exactly. In English, you have different sentences to say "I have a horse" and "I have one horse". There's also a different sentence to emphasise "I have only one horse". In German, you can say the last one unambiguously as you have written, but the first two seem to translate the same.
In German there is no distinction between »a« and »one«. As a English native the best way to look at it is the following. Ich habe nur ein Pferd. = I have only a(one) horse. Ich habe ein Pferd = I have a horse.
(Yes I realised this is two years old but I already typed this up so maybe it will help others.)
Regarding the pronunciation, do not expect it to follow English pronunciation rules (a German will never pronounce it 'dieserrrr'). The final sound for dieser is a vowel sound, but a different vowel sound to diese. Listen to recordings on the internet, such as from dict.cc, YouTube, or Forvo (diese, dieser).
Regarding the usage, dies- means "this/these". As in English, it can be used:
attributively with a noun ("this horse is...");
non-attributively without a noun ("this is..."); or
non-attributively with the noun implied ("this one is...).
If it is used attributively (#1), it needs to be declined (the ending must change) following the same pattern as for der/die/das. In this example, Mann is a masculine noun in nominative case, so it would use der, i.e. with an -er ending. So if we want to use dies- here, it needs to be dieser.
If it is used non-attributively (#2), it does not get an ending. This is because there's no gender information tied to it yet... it's 'blank'. I can say Was ist dies? without having any idea what the thing is, and hence without any idea whether it should be masculine, feminine, neuter or plural. This is similar to how das can be used without a noun. Roughly, use dies as "this/these" and das as "that/those", although they are also used more interchangeably than in English. I have heard Germans say that you can use das for everything, as dies sounds a bit formal.
If it is used with an implied noun (#3), then it also gets an ending in the same way as #1. What I mean by an implied noun, is for example: "What do you think of these horses?" "I like this one". It's clear here from the context that it means "this horse", but it sounds repetitive to say "horse" again, so we just say "this one". In German, since we know we're talking about a horse which is a neuter noun, we need to decline according to this, so we get Ich mag dieses.
If 'this' is with helping verb 'is' then we can use either 'dies' or 'das'. Eg. Das ist ein Buch or Dies ist ein Buch. But if 'this' is with a noun then we have to consider the gender of the noun. 'dieser', 'diese' and 'dieses' with Masc, fem, neutral respectively. Hope it helps.
In Duolingo it is mentioned that I can use Definite Articles (Die, Der, Das) in case of that, this, those etc.... But usage of words like Dies, Dieses etc... contradicts this... Now I am confused, when to use which word... Can anybody help me to understand this difference of context...
it turned out to be true I think :P life is really short to learn German lol but seriously I need "jemand" to explain to me the difference between dies and its other versions like a baby :P :P so please help me :P Yesterday, I solved the problem of possessive pronouns :P as there are two types of "sie" and each one has a different pronoun, but whatever, just help me with this "dies" and its siblings :PP lol viele dank :*