Questions & Answers about Приложи карту к валидатору ещё раз.
Why is the verb приложи and not приложить?
Приложи is the imperative form, so it means put/tap/hold it against...!
- приложить = the dictionary form, to place against / to apply
- приложи = apply it / tap it (said to one person, informally)
So the sentence is giving an instruction, not naming the action.
This form is used when speaking to:
- one person
- in an informal way
The polite/plural version would be:
- Приложите карту к валидатору ещё раз.
Why is карту in this form?
Карту is the accusative singular form of карта.
That is because it is the direct object of the verb приложи: it is the thing being placed against the validator.
- nominative: карта = card
- accusative: карту = card, as the object of the action
This is very common in Russian: feminine nouns ending in -а usually change to -у in the accusative singular.
Why is it к валидатору and not к валидатор?