Jeg har det med at glemme små ting om morgenen, så jeg tjekker altid tasken to gange.

It is an idiomatic expression meaning to tend to or to have a habit of doing something.

So:

• Jeg har det med at glemme ... = I tend to forget ...
• Han har det med at komme for sent = He tends to arrive late

You usually learn it as a whole chunk:

have det med at + infinitive

Here, det does not mean a specific it. It is just part of the fixed expression have det med at.

So it is best not to translate each word literally. Think of the whole phrase as one unit:

• have det med at = tend to

If you remove det, the sentence would sound wrong.

Because after have det med at, Danish uses the infinitive form of the verb.

Structure:

• Jeg har det med at glemme
• Vi har det med at vente
• Hun har det med at overreagere

So:

• har = the finite verb in the clause
• at glemme = infinitive, to forget

This is similar to English to forget after tend to.

No. In this sentence, har is not an auxiliary helping to form a perfect tense. It is the main verb inside the expression har det med at.

So the sentence is not saying I have forgotten. It is saying I tend to forget.

The whole sentence is in the present tense, describing a general habit.

Små ting means small things, and it is an indefinite plural phrase.

A few useful points:

• ting is plural here: things
• Danish usually does not use an article in indefinite plural
• små is the plural form used with lille

Compare:

• en lille ting = a small thing
• små ting = small things

So små ting is exactly the natural way to say small things.

Om morgenen is a very common Danish time expression meaning in the morning.

It uses:

• om = about/around/in certain time expressions
• morgenen = the morning in the definite form

This pattern is common:

• om morgenen = in the morning
• om aftenen = in the evening
• om natten = at night

So this is something you should learn as a standard expression.

Also, be careful not to confuse it with:

• i morgen = tomorrow

Those are completely different.

Because the sentence contains two main clauses:

1. Jeg har det med at glemme små ting om morgenen
2. så jeg tjekker altid tasken to gange

In Danish, it is normal to separate coordinated main clauses with a comma.

So the comma helps show the break between:

• the reason/problem
• the result/consequence

Here så means so.

That is a very good question, because both patterns exist in Danish, but they do not work the same way.

In this sentence, så is being used like a conjunction meaning so, linking two clauses:

• ..., så jeg tjekker altid tasken ...
• ..., so I always check the bag ...

In that case, the new clause begins normally with the subject:

• jeg tjekker

But if så were acting more like an adverb meaning then, you could get:

• Så tjekker jeg tasken
• Then I check the bag

So:

• så jeg tjekker = so I check
• så tjekker jeg = then I check

Because altid is an adverb of frequency, and in a normal main clause it often comes after the finite verb and before the object.

Here the order is:

• jeg = subject
• tjekker = finite verb
• altid = adverb
• tasken = object
• to gange = adverbial phrase

So:

Jeg tjekker altid tasken to gange

This is a very natural Danish word order.

Compare:

• Jeg læser altid avisen
• Hun glemmer ofte nøglerne

Tasken is the definite form: the bag.

Danish often uses the definite form when the thing is understood from context, especially with personal belongings or things closely connected to the person.

So here tasken naturally means something like:

• the bag / my bag

If you said min taske, that would also be possible, but it would sound a bit more explicit or emphasized.

Compare:

• Jeg vasker hænderne = I wash my hands
• Jeg tog jakken på = I put on my jacket
• Jeg tjekker tasken = I check my/the bag

To gange means two times.

The noun gang can mean time/occasion in this kind of expression.

So:

• en gang = once / one time
• to gange = two times
• tre gange = three times

Because the number is more than one, Danish uses the plural form gange.

This is a very common expression:

• Jeg har set filmen to gange
• Hun læste brevet flere gange

Yes. At tjekke is a common Danish verb, borrowed from English check.

Its forms are:

• at tjekke = to check
• tjekker = check/checks
• tjekkede = checked
• har tjekket = have checked

It is very common in everyday Danish, especially in speech.

You may also see more formal or native alternatives in some contexts, but tjekke is completely normal here.

Because the sentence has two separate main clauses, and each main clause normally needs its own subject.

So Danish says:

• Jeg har det med at glemme ..., så jeg tjekker ...

Even though English also repeats I here, learners sometimes expect Danish to drop it. But in this structure, Danish keeps it.

The repetition makes the sentence clear and grammatically complete.