Jeg er takknemlig for at du hjelper meg når jeg ikke tør å ringe legen selv.

Because Norwegian often uses the pattern takknemlig for ....

• takknemlig for noe = grateful for something
• takknemlig for at + clause = grateful that ...

So:

• Jeg er takknemlig for hjelpen. = I am grateful for the help.
• Jeg er takknemlig for at du hjelper meg. = I am grateful that you help me.

To an English speaker, for at may look strange because English usually just says grateful that. In Norwegian, this is the normal structure.

Because hjelper is the present tense form of å hjelpe.

• å hjelpe = to help
• hjelper = help / is helping

After du, you need the finite verb form:

• du hjelper = you help / you are helping

Norwegian verbs do not change for person the way English verbs sometimes do, but they still change for tense. So:

• jeg hjelper
• du hjelper
• han hjelper

all use hjelper in the present tense.

Because this is a subordinate clause introduced by når.

In Norwegian:

• In a main clause, the negation usually comes after the finite verb:
  Jeg tør ikke. = I don’t dare.
• In a subordinate clause, the negation usually comes before the finite verb:
  ... når jeg ikke tør ... = ... when I don’t dare ...

That is why the sentence says:

• når jeg ikke tør å ringe legen selv

and not:

• når jeg tør ikke å ringe legen selv

This subordinate-clause word order is one of the most important patterns to learn in Norwegian.

Tør is the present tense of å tørre.

It usually means:

• to dare
• to have the nerve/courage to
• sometimes to feel able to, especially emotionally

In this sentence, jeg ikke tør å ringe legen selv suggests something like:

• I don’t dare call the doctor myself
• I’m not brave enough to call the doctor myself
• I don’t feel able to call the doctor myself

So it is not mainly about physical ability. It is more about courage, confidence, or emotional difficulty.

Because å tørre is normally followed by å + infinitive.

So the pattern is:

• å tørre å gjøre noe = to dare to do something

Examples:

• Jeg tør å spørre. = I dare to ask.
• Hun tør ikke å si det. = She doesn’t dare say it.

English can say both dare say it and dare to say it, but Norwegian normally keeps the å before the next verb.

Because legen is the definite form: the doctor.

• en lege = a doctor
• legen = the doctor

Here, the speaker is probably talking about a specific doctor already understood from context, often:

• their own doctor
• the doctor’s office they would normally contact
• a doctor both speaker and listener can identify

Norwegian often uses the definite form when the reference is clear from the situation.

Because in Norwegian, ringe can take a direct object.

• å ringe noen = to call someone

So:

• ringe legen = call the doctor
• ringe moren min = call my mother

English often uses call someone, so this part is actually fairly similar. If you were expecting something like ringe til legen, you should know that til can also appear in some contexts, but ringe legen is very natural and common.

Here selv means myself or on my own.

So:

• å ringe legen selv = to call the doctor myself

It emphasizes that the speaker would have to do it without help from someone else.

Compare:

• Jeg ringer legen. = I call the doctor.
• Jeg ringer legen selv. = I call the doctor myself.

In this sentence, selv makes it clear that the speaker is grateful because the other person helps in a situation where the speaker does not dare make the call alone.

Because når is used for something general, repeated, or whenever it happens.

Here the idea is:

• when / whenever I don’t dare call the doctor myself

That sounds like a recurring type of situation, not one single event.

Very roughly:

• når = when / whenever, often general or repeated
• da = when, at that specific time, often about a particular past event

So når fits better here.

Because meg is the object form of the pronoun.

• jeg = I
• meg = me

In the sentence:

• du hjelper meg = you help me

du is the subject, and meg is the object.

This is the same kind of difference as English I versus me.