Hon ska skicka in sin ansökan den åttonde maj.

Ska can often mean either will / is going to or shall / is supposed to, depending on context.

In this sentence, Hon ska skicka in sin ansökan ..., it most naturally means something like:

• She is going to submit her application ...
• or She will submit her application ...

So ska is a very common way to talk about the future in everyday Swedish.

A few comparisons:

• Hon ska resa imorgon. = She is going to travel tomorrow.
• Du ska göra läxan. = You must/are supposed to do the homework.

So the exact nuance comes from context.

Skicka in is a verb + particle combination, similar to English send in or submit.

• skicka = send
• skicka in = send in / submit

With things like applications, forms, tax returns, and assignments, Swedish often uses skicka in.

Examples:

• skicka in en ansökan = submit an application
• skicka in blanketten = send in the form

So in is an important part of the meaning here.

Yes, sometimes. Swedish particle verbs can behave a bit like English phrasal verbs.

In an infinitive after ska, it stays together:

• Hon ska skicka in sin ansökan.

But in some other sentence patterns, the particle may come later:

• Hon skickade in sin ansökan igår.
• Hon skickade sin ansökan in? → this sounds wrong in modern Swedish for this meaning

With skicka in, the normal phrasing is to keep in close to the verb, especially in straightforward sentences like this one.

So for a learner, the safest pattern is:

• ska skicka in
• skickar in
• skickade in

This is one of the most important Swedish grammar points.

Swedish uses sin/sitt/sina when the possessor is the same as the subject of the clause.

Here:

• subject = Hon (she)
• owner of the application = the same person

So Swedish uses sin:

• Hon ska skicka in sin ansökan. = She is going to submit her own application.

If you say hennes ansökan, it usually means another woman’s application, not her own.

Compare:

• Hon skickade in sin ansökan. = She submitted her own application.
• Hon skickade in hennes ansökan. = She submitted her application, but hers belongs to some other female person.

Because the form of the reflexive possessive matches the noun, not the owner.

The forms are:

• sin for en-words
• sitt for ett-words
• sina for plural nouns

Here the noun is ansökan, and the base word is:

• en ansökan

So it takes sin:

• sin ansökan

Examples:

• Hon tvättar sin bil. (bil is an en-word)
• Hon tvättar sitt fönster. (fönster is an ett-word)
• Hon tvättar sina kläder. (plural)

Ansökan means the application.

The base noun is:

• en ansökan = an application

The indefinite and definite forms are:

• en ansökan = an application
• ansökan = the application
• ansökningar = applications
• ansökningarna = the applications

In this sentence, the definite form is used because it refers to a specific application: her application.

This is a standard Swedish way to say a date.

• den = the
• åttonde = eighth
• maj = May

So literally it is the eighth (of) May.

Swedish commonly expresses dates with:

den + ordinal number + month

Examples:

• den första januari = the first of January
• den tredje juni = the third of June
• den tjugofjärde december = the twenty-fourth of December

In everyday writing, you may also see:

• 8 maj
• 8/5

But when fully written out, den åttonde maj is very normal.

Because dates use ordinal numbers, not cardinal numbers.

• åtta = eight
• åttonde = eighth

English does the same:

• May eight is possible in some contexts, especially American English
• but the eighth of May uses the ordinal

Swedish normally uses the ordinal in this type of full date expression:

• den åttonde maj
• not den åtta maj

Usually no. In Swedish, month names are normally written with lowercase letters unless they begin a sentence.

So:

• maj
• januari
• oktober

This is different from English, where May and October are capitalized.

So den åttonde maj is correct, not den åttonde Maj.

This is normal Swedish main-clause word order.

The basic pattern is:

subject + finite verb + rest

Here:

• Hon = subject
• ska = finite verb
• skicka in sin ansökan den åttonde maj = rest of the sentence

So:

• Hon ska skicka in sin ansökan den åttonde maj.

This is the ordinary structure for a simple statement.

If another element comes first, Swedish still keeps the finite verb in second position:

• Den åttonde maj ska hon skicka in sin ansökan.

That is a very important Swedish rule called V2 word order.

Yes. Swedish is fairly flexible with time expressions.

These are all possible, though they can differ slightly in emphasis:

• Hon ska skicka in sin ansökan den åttonde maj.
• Den åttonde maj ska hon skicka in sin ansökan.
• Hon ska den åttonde maj skicka in sin ansökan. (possible, but a bit more formal or marked)

The most neutral version here is probably the original one, with the date at the end.

Yes, it is possible.

• Hon ska skicka in sin ansökan ...
• Hon kommer att skicka in sin ansökan ...

Both can refer to the future, but they are not always identical in feel.

Very roughly:

• ska often sounds more natural and common in everyday Swedish for planned future actions
• kommer att can sound a bit more like will in a neutral predictive sense

In this sentence, because submitting an application is usually a planned action, ska is very natural.

The written sentence is already quite natural. In speech, pronunciation may be a bit more relaxed, but the wording itself is normal.

A speaker might say it smoothly as:

• Hon ska skicka in sin ansökan den åttonde maj.

In casual conversation, a person might also choose a shorter date style if the context is clear:

• Hon ska skicka in sin ansökan åttonde maj.
• Hon ska skicka in sin ansökan den 8 maj.

But the original sentence is standard, correct, and natural.