A little help with Acc. Case?
I'm learning German and having some trouble when strengthening the Acc. Case lesson.... I don't really know when to use trinken, trinkt, or trinkst; hat, habt and habe; and other words in the lesson. Any tips on how to know when to use which word?
MartinCroft already pointed out that these are merely conjugations of verbs, but your question has not been answered at all. Perhaps the question I should ask you is this: what problem specifically are you encountering when learning the Akkusativ case?
The Akkusativ case is all about whether your sentence contains a direct object or not.
First, here is an example of the Nominativ case:
Ich bin ein Mann. I am a man.
No direct object. The determiner here (ein) is in the Nominativ case. The nominative is always used after “sein” to be and “werden” to be or to become. Another way to think of this is that there is no action being done to another person or object. It might help to think of it like this. With Akkusativ, you can accuse someone of something. Nominativ is basically just a way to make a statement (ex. Der Mann rennt. The man runs.) There can of course be action with Nominativ, but as you can see nothing is being directly verb-ed or affected by the man in that sentence. It is simply a statement or observation. With Nominativ, you could say it is very likely that only one person or thing is involved in the sentence.
Now, here is an example of the Akkusativ case in action:
Ich küsse einen Mann. I kiss a man.
See how "ein" changed to "einen"? The addition of the -en on the determiner before a masculine noun such as "der Mann" shows us that the Mann is no longer the subject of the sentence. Instead, he has become the direct object. More specifically speaking, the man in the sentence is the one being kissed. You could also say, "Ich liebe den Mann". That is also Akkusativ, because something is happening to the man. He is being loved. With Akkusativ, you could say that there is always more than one person or object in the sentence. Someone ( or something) is doing (or being done) to someone (or something) else.
Also keep in mind that this sentence involves both the Nominativ and the Akkusativ case. Ich (subject, Nominativ) küsse (verb) den Mann (direct object, Akkusativ).
See how that works? The Akkusative case is really very easy because only masculine nouns receive any kind of change in their determiners. You just have to ask yourself--do I have a direct object or not?
Feminine, neutral, and plural nouns remain the same.
Das sind die Leute. (Those are the people. Nominativ).
Ich mag die Leute. (I like the people. Akkusativ).
Das ist ein Auto. (That is a car. Nominativ).
Ich habe ein Auto. (I have a car. Akkusativ).
Das ist eine Blume. (That's a flower).
Ich habe eine Blume. (I have a flower).
The real fun comes with the Dativ and Genetiv cases. And declining adjectives! Woohoo!