Kukuřice a žampion jsou v alobalu.

Because the subject is compound: kukuřice a žampion = corn and a mushroom / the mushroom.
When two things are joined by a (and), Czech normally uses a plural verb.

• je = is
• jsou = are

So:

• Kukuřice a žampion je... would be incorrect
• Kukuřice a žampion jsou... is correct

Because the sentence is talking about one mushroom, not several.

• žampion = mushroom (singular)
• žampiony = mushrooms (plural)

So this sentence means something like the corn and the mushroom are in the foil or corn and a mushroom are in the foil, depending on context.

If there were several mushrooms, you could say:

• Kukuřice a žampiony jsou v alobalu.

Grammatically, kukuřice is singular. It is a feminine noun.

It often works like a mass noun, similar to English corn. Even though corn may consist of many kernels, the word itself is treated as singular.

So in this sentence:

• kukuřice = singular
• žampion = singular
• together they form a plural subject, so the verb is jsou

Because the preposition v (in) takes the locative case when it expresses location.

The dictionary form is:

• alobal = aluminum foil / tin foil

After v, it changes to the locative singular:

• v alobalu = in the foil

This is a very common Czech pattern:

• v domě = in the house
• v autě = in the car
• v alobalu = in the foil

So the ending changes because of case.

Alobal means aluminum foil or tin foil in everyday English.

So v alobalu means:

• in foil
• wrapped in foil
• inside aluminum foil

Depending on context, English might translate it a little differently, but the Czech word itself is the normal everyday word for kitchen foil.

Czech does not have articles like English the and a/an.

That means a sentence like Kukuřice a žampion jsou v alobalu can mean different things depending on context, for example:

• Corn and a mushroom are in the foil
• The corn and the mushroom are in the foil
• The corn and a mushroom are in foil

Czech usually leaves that distinction to context, word order, or the situation.

A rough English-style guide is:

• kukuřice ≈ koo-koo-rzhi-tseh

A few notes:

• ku-ku sounds like koo-koo
• ř is the famous Czech sound, something like a mix of r and zh
• ce at the end sounds like tseh

The hardest part is usually ř. If you cannot say it yet, a temporary approximation like rž or even just r is understandable for beginners.

A rough guide is:

• žampion ≈ zham-pyon

More exactly:

• ž sounds like the s in measure
• pi before o gives a pyo-like sound
• stress in Czech is normally on the first syllable, so ŽAM-pion

So the word starts with the zh sound, not with English j as in jam.

Yes. Czech word order is fairly flexible, because case endings do a lot of the grammatical work.

The neutral order here is:

• Kukuřice a žampion jsou v alobalu.

But you could also say:

• V alobalu jsou kukuřice a žampion.

That version puts more focus on where they are.

Even though word order can change, the meaning stays basically the same because:

• kukuřice a žampion is still the subject
• jsou is still the verb
• v alobalu is still the location

Usually žampion refers specifically to a champignon / button mushroom, the common white or brown mushroom used in cooking.

So it is a bit more specific than the general English word mushroom.

If you want a more general word, Czech often uses:

• houba = mushroom / fungus
• žampion = champignon, button mushroom

In everyday food contexts, žampion is very common.

A is the conjunction and.

It joins the two nouns:

• kukuřice
• žampion

So:

• kukuřice a žampion = corn and mushroom

It is one of the most basic and common Czech conjunctions.