Questions & Answers about Налёт появился на крышке.
In this sentence, налёт most likely means a coating, film, deposit, or buildup on a surface.
That word is a little tricky because it has several meanings in Russian depending on context, including things like raid or air raid. But with на крышке (on the lid / on the cover), the physical-surface meaning is the natural one.
So here it means something like a thin layer or residue that formed on the lid.
Because появился is the masculine singular past tense form, and it agrees with налёт, which is a masculine singular noun.
Russian past tense agrees in gender and number with the subject:
- masculine: появился
- feminine: появилась
- neuter: появилось
- plural: появились
Since налёт is masculine, you get налёт появился.
It is perfective.
The verb pair is:
- появляться — imperfective
- появиться — perfective
In the sentence Налёт появился на крышке, the perfective verb shows that the deposit appeared / came into existence as a completed event.
If you used the imperfective, it would suggest something like repeated appearance, process, or background description in the right context.