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sidebar_position: 6
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# Instrumental
## When to use the instrumental case
1. To indicate the means by which an action is performed.
* I write with a pen
* Я пишу ручкой
2. To indicate the person or thing with which something is done
* I go with my friend
* Я иду с другом
## Nouns
### Singular
| Masculine | Feminine | Neutral |
|-------------------------------|-----------------------------------|-------------------------|
| (ends in consonant) -> add -а | (Г, К, Х, Ж, Ч, Ш, Щ) + -а -> -и (otherwise) -а -> -ы | |
| -й -> -я | -ь -> -и | о -> а |
| -ь -> -я | -я -> -и | е -> я |
| | | мя -> мени |
### Plurals
| Masculine | Feminine | Neuter |
|----------------------------|-------------------------------------------------------|----------|
| (ends in consonant) -> -ов | | |
| (ends in ж, ч, ш or щ) -> -ей | | |
| -й -> -ев | -а -> - | -о -> - |
| -ь -> -ей | -я -> -ь | -е -> -ей |
| | -ия -> -ий | -ие -> -ий |
| | -ь -> -ей | |
## Examples
I don't have a cat
У меня нет кота
(У меня, нет, кот)
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This is the door of the house
Это дверь дома
(Это, дверь, дом)