W mojej torbie zawsze jest mała apteczka, więc mam tam też chusteczki i termometr.

There is always a small first-aid kit in my bag, so I also have tissues and a thermometer there.

Breakdown of W mojej torbie zawsze jest mała apteczka, więc mam tam też chusteczki i termometr.

• ja: I
• być: to be
• mieć: to have
• mój: my

Questions & Answers about W mojej torbie zawsze jest mała apteczka, więc mam tam też chusteczki i termometr.

Why is it w mojej torbie and not w moja torba?

Because the preposition w meaning in takes the locative case when it describes location.

So:

• moja torba = my bag (dictionary/basic form)
• w mojej torbie = in my bag

Both words change because they must match in case, gender, and number:

• moja → mojej
• torba → torbie

This is a very common Polish pattern:

• w domu = in the house
• w szkole = at school
• w mojej torbie = in my bag

Why is the verb jest singular?

Because in the first clause, the thing that is in the bag is mała apteczka — a small first-aid kit — and that noun is singular.

So:

• mała apteczka = singular
• therefore jest = singular is

Even though the sentence later mentions chusteczki i termometr, those belong to the second clause:

• mam tam też chusteczki i termometr = I also have tissues and a thermometer there

The two clauses work separately:

1. W mojej torbie zawsze jest mała apteczka
2. więc mam tam też chusteczki i termometr

Why is it mała apteczka after jest, not some other case?