Если стелька мокрая, я сушу обувь у батареи до утра.

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Breakdown of Если стелька мокрая, я сушу обувь у батареи до утра.

• утро: the morning
• если: if
• у: by

Questions & Answers about Если стелька мокрая, я сушу обувь у батареи до утра.

Why is there no word for is in Если стелька мокрая?

In Russian, the verb to be is usually omitted in the present tense.

So:

• стелька мокрая = the insole is wet
• literally, Russian just says insole wet

If you wanted past or future, a form of быть would appear:

• Стелька была мокрая = The insole was wet
• Стелька будет мокрая = The insole will be wet

Why is it мокрая and not мокрый?

Because мокрая has to agree with стелька.

Стелька is:

• feminine
• singular
• nominative

So the adjective must also be:

• feminine
• singular
• nominative

That gives мокрая.

Compare:

• мокрый = masculine
• мокрая = feminine
• мокрое = neuter
• мокрые = plural

What case is стелька here?

It is in the nominative case because it is the subject of the clause:

• стелька мокрая = the insole is wet

The noun being described as wet is the subject, so nominative is the normal case here.

Why is it and not some different form?