Czy miałeś kupić morele i awokado, czy ja miałam to zrobić po pracy?

They do two slightly different jobs here.

• The first Czy at the very start is a question particle. It signals that the whole sentence is a question.
• The second czy links two alternatives and works like or in an alternative question.

So the pattern is roughly:

Czy X, czy Y? = Was it X, or was it Y?

This is past tense of mieć + infinitive.

In this pattern, mieć does not mean simple possession, as in to have. Instead, it expresses that someone was supposed to, meant to, or expected to do something.

So:

• miałeś kupić = you were supposed to buy
• miałam to zrobić = I was supposed to do it

Because Polish past tense agrees with person, number, and also gender.

Here:

• miałeś = you singular, addressed to a man
• miałam = I, said by a woman

If the listener were female, it would be miałaś.
If the speaker were male, it would be miałem instead of miałam.

No. It only tells you that this was the plan, duty, or expectation.

Very often this structure suggests:

• a reminder,
• uncertainty about what was supposed to happen,
• or even mild reproach.

So miałeś kupić can sound a bit like weren’t you the one who was supposed to buy them?

Because the sentence is about single, completed tasks.

• kupić = to buy, as a completed act
• zrobić = to do, to get done, as a completed act

If you used imperfective forms such as kupować or robić, the meaning would shift more toward process, repetition, or ongoing action rather than one completed errand.

To stands for the earlier action: buying the apricots and avocado.

So to zrobić means do that or do it. It avoids repeating the whole phrase kupić morele i awokado.

In other words:

• ja miałam to zrobić = I was supposed to do that / do it

Both word orders are possible in Polish, but miałam to zrobić is very natural and neutral here.

Polish short pronouns like to often appear before the infinitive in this kind of construction:

• miałam to zrobić
• chcę to kupić
• muszę to sprawdzić

Zrobić to is also grammatical, but it usually sounds a bit more marked or emphatic in a sentence like this.

They are the direct objects of kupić, so they are in the accusative.

• morele is accusative plural here
• awokado also appears here in the object form awokado

For a learner, the main point is: after kupić in this sentence, these nouns are functioning as things being bought.

Because the preposition po meaning after takes the locative case.

The noun praca changes to pracy in the locative singular:

• praca = work
• po pracy = after work

This is a very common expression in Polish.

Polish word order is fairly flexible, so it could be changed, but the original version sounds natural and neutral.

Different orders change the emphasis:

• Czy ja miałam to zrobić po pracy? puts more emphasis on I
• Czy po pracy miałam to zrobić? puts more emphasis on after work

The original sentence is a straightforward way to ask which person was supposed to do the shopping and when.