Bancnota este în portofel.

Because Romanian usually puts the definite article at the end of the noun.

• bancnotă = a banknote
• bancnota = the banknote

So -a here is not just part of the noun stem. It shows that the noun is definite.

This is very different from English, where you would use a separate word, the.

Este means is. It is the 3rd person singular present form of the verb a fi = to be.

So:

• bancnota = the banknote
• este = is
• în portofel = in the wallet / in a wallet, depending on context

This is a completely normal use of este in Romanian.

Romanian usually uses an attached definite article instead of a separate word.

Compare:

• English: the banknote
• Romanian: bancnota

And:

• English: the wallet
• Romanian: portofelul

So instead of putting the before the noun, Romanian often adds it to the end.

This is a very common learner question.

In Romanian, after a preposition, a bare noun like portofel can sometimes sound natural even when English would use the wallet. Romanian often leaves the noun without the definite article in common location expressions, especially when the context already makes the meaning clear.

So:

• în portofel = in a wallet or in the wallet, depending on context
• în portofelul meu = in my wallet
• în portofelul acesta = in this wallet

If you want to make the wallet clearly definite and specific, you would usually say something like în portofelul meu, în portofelul lui, and so on.

So the sentence as given is natural, but the exact English article can depend on context.

În means in or inside.

The vowel î is a Romanian sound that English does not really have. It is a central, tight vowel. A good beginner approach is:

• keep your tongue fairly central
• make a short, tense vowel
• do not turn it into ee or oo

Also, în is pronounced as one syllable.

So în portofel means in the wallet / in a wallet.

Yes. The base noun is bancnotă, which is feminine.

That matters because adjectives and some other words must agree with it.

For example:

• o bancnotă nouă = a new banknote
• bancnota nouă = the new banknote

The ending -ă in the basic form bancnotă is a common sign of a feminine noun, though not every feminine noun ends that way.

The given word order is the most neutral and straightforward one:

• Bancnota este în portofel.

This is basically:

• subject + verb + place

Romanian word order is fairly flexible, so other orders are possible for emphasis, but they do not sound as neutral.

For example:

• În portofel este bancnota.

This can sound more marked, as if you are emphasizing the location.

So for a learner, the given order is the safest default.

It is capitalized because it is the first word of the sentence.

Romanian capitalization works much like English in this respect. Common nouns such as bancnotă and portofel are not normally capitalized in the middle of a sentence.

The dictionary forms are:

• bancnotă = banknote
• a fi = to be
• în = in
• portofel = wallet

So the sentence uses:

• bancnota from bancnotă
• este from a fi
• portofel in its basic noun form

This is useful because Romanian dictionaries usually list nouns in the indefinite singular form, not the definite one.

Normally, no. In standard Romanian, este is usually kept in a sentence like this.

So:

• Bancnota este în portofel. = correct

Dropping este would not be standard here.

That is different from some languages where the present form of to be is often omitted. Romanian generally keeps it.

You would usually use the indefinite article o for a banknote:

• O bancnotă este în portofel.

Compare:

• Bancnota este în portofel. = The banknote is in the wallet / wallet
• O bancnotă este în portofel. = A banknote is in the wallet / wallet

So the difference between bancnota and o bancnotă is the difference between the banknote and a banknote.