Hon blev verkligen överraskad när alla kom i tid och sjöng för henne.

Blev is the past tense of bli, which means to become. In this sentence, hon blev överraskad means she became surprised or more naturally in English, she was surprised.

Swedish often uses bli + past participle/adjective to show a change of state:

• Hon blev trött. = She got tired.
• Han blev arg. = He got angry.
• Hon blev överraskad. = She became/got surprised.

If you used var instead, it would describe her state more statically:

• Hon var överraskad. = She was surprised.

So blev emphasizes the moment or event of becoming surprised.

Here, överraskad agrees with hon, which is common gender singular.

Swedish adjectives and participle-like forms often change depending on gender and number:

• en-word / common gender singular: överraskad
• ett-word / neuter singular: överraskat
• plural: överraskade

Examples:

• Hon blev överraskad.
• Barnet blev överraskat.
• De blev överraskade.

So because hon refers to one person, the correct form is överraskad.

Verkligen means really, truly, or genuinely.

In this sentence, Hon blev verkligen överraskad means She was really surprised.

It is placed before överraskad to intensify that word. This is very natural in Swedish.

Compare:

• Hon blev verkligen överraskad. = She was really surprised.
• Hon blev överraskad. = She was surprised.

You can often think of verkligen as an adverb that strengthens what follows.

När means when.

It introduces a subordinate clause:

• när alla kom i tid och sjöng för henne
• when everyone arrived on time and sang for her

So the full structure is:

• main clause: Hon blev verkligen överraskad
• subordinate clause: när alla kom i tid och sjöng för henne

This is very similar to English when.

In the subordinate clause introduced by när, Swedish keeps normal subject-verb order:

• alla = subject
• kom = verb

So:

• när alla kom i tid = when everyone arrived on time

This is the expected order in Swedish subordinate clauses.

A useful thing to remember is that Swedish subordinate clauses often differ from main clauses mainly in the placement of sentence adverbs like inte, but the subject still normally comes before the verb.

For example:

• main clause: Alla kom i tid.
• subordinate clause: ... när alla kom i tid.

So nothing unusual is happening here.

Because the sentence is describing completed events in the past.

• kom is the past tense of komma = to come / arrive
• sjöng is the past tense of sjunga = to sing

The sentence tells us what happened:

1. everyone arrived on time
2. they sang for her
3. she was surprised

Swedish uses the simple past here just as English often does:

• alla kom i tid och sjöng för henne
• everyone arrived on time and sang for her

I tid means on time or in time, depending on context.

In this sentence, it clearly means on time:

• alla kom i tid = everyone arrived on time

This is a very common expression in Swedish.

Compare:

• Jag kom i tid. = I arrived on time.
• Vi hann i tid. = We made it in time.

So the exact English translation depends on context, but the Swedish phrase is the same.

Sjunga för någon means to sing for someone.

So:

• sjöng för henne = sang for her

Using till henne would sound more like to her, and that is not the usual preposition with sjunga in this meaning.

Common Swedish patterns include:

• sjunga för någon = sing for someone
• köpa något till någon = buy something for someone
• säga något till någon = say something to someone

So this is mainly a verb + preposition pattern you learn as a set: sjunga för någon.

Alla means everyone or all people here.

Even though it refers to multiple people, Swedish verbs do not change form for singular and plural in the present or past the way English sometimes does. So the verb form stays the same.

For example:

• Jag kom. = I came.
• Hon kom. = She came.
• Vi kom. = We came.
• Alla kom. = Everyone came.

So kom works for any subject in the past tense.

Because sjöng is simply coordinated with kom using och.

The structure is:

• alla kom i tid och sjöng för henne
• everyone arrived on time and sang for her

Both verbs share the same subject, alla.

You do not use att here because this is not an infinitive construction. Both verbs are finite past-tense verbs:

• kom = arrived
• sjöng = sang

So this is just a normal coordination:

• X did A and did B

A learner could reasonably see it either way at first, because forms like överraskad can look similar in both uses.

In Hon blev verkligen överraskad, it is best understood as part of a bli construction meaning that she became surprised. In practice, this functions very much like an adjective describing her state after the event.

Swedish often uses past participle forms this way:

• Han blev skadad. = He got injured.
• Dörren blev stängd. = The door got closed / was closed.
• Hon blev överraskad. = She got surprised / was surprised.

So for a learner, the most useful way to understand it is:

• bli + participle often means become/get + adjective-like state

Yes. A very helpful breakdown is:

• Hon = she
• blev = became / got / was
• verkligen = really
• överraskad = surprised
• när = when
• alla = everyone
• kom = came / arrived
• i tid = on time
• och = and
• sjöng = sang
• för henne = for her

So the structure is:

• Hon blev verkligen överraskad main idea
• när alla kom i tid och sjöng för henne explains when and why

That kind of chunking is often the easiest way to read longer Swedish sentences.