For starters, to explain the meaning of the texts in the speech you can with the help of simple exercises. Make a offer and make it a planned mistake. For example: "on Sunday we will go to visit the grandmother with the grandfather." Ask your child what is wrong in this sentence? Usually children find and correct obvious errors without difficulty. On such examples it is possible to demonstrate that cases do our speech is associated, thanks to them, we could easily understand each other.
In the Russian language in all six key cases. Remember their sequence helps a familiar childhood poem. It is quite unusual, but is the best promotes the uptake of priority cases:
Ivan (Nominative)
Begat (Genitive)
The Girl (Dative)
Told Me (Accusative)
To Drag (Instrumental)
A Diaper (Prepositional)
The initial letter of each words of the poem corresponds to the first letter case. It is a kind of mnemonic that helps memorization by way of extensions of associative connections.
The same applies for the other expression, remembering which will also help to learn the order of nouns:
Ivan (Nominative)
Chopped (Genitive)
Firewood (Dative)
Barbara (Accusative)
Stoked (Instrumental)
Oven (Prepositional)
Knowing your child, you can come up with any other utterance built according to this principle.
Memorization of cases and corresponding questions help of auxiliary words and little tips.
The nominative case answers the questions "who?" "what?" ("Mary", "chair", "horse").
Genitive – is not with us "who?", "what?" ("Masha", "chair", "horse").
Dative – give a toy "who?", "what?" ("Masha", "chair", "horse").
Accusative case – see near, far away "who?", "what?" ("Mary", "chair", "horse").
The instrumental case is they are doing (drawing, writing) together "with whom?", "what?" ("Masha", "chair", "horse").
Prepositional case – I propose to speak, "who?", "what?" ("about Masha" "on chair" "the horse").
Necessarily in this case, pay attention to the child's identity of the initial letters in the title of the case and auxiliary words: "the dative is to give", "accusative – see", "by – doing", "prepositional – offer."