Mi deponis monbileton hieraŭ.

In Esperanto, -is marks the past tense. So deponis means deposited.

The verb breaks down like this:

• depon- = the verb root, meaning deposit
• -is = past tense

Unlike English, Esperanto uses the same past-tense ending for all subjects:

• mi deponis = I deposited
• vi deponis = you deposited
• li/ŝi deponis = he/she deposited

The verb does not change depending on the person.

The -n marks the direct object. In this sentence, monbileton is the thing that was deposited, so it takes the accusative ending -n.

Compare:

• Mi deponis monbileton. = I deposited a banknote.
• Monbileto kuŝis sur la tablo. = A banknote was lying on the table.

In the second example, monbileto is the subject, so there is no -n.

A useful rule:

• -o = noun
• -on = noun used as a direct object

Monbileto means banknote or paper bill.

It is built from parts:

• mono = money
• bileto = ticket, note, slip, bill

So monbileto literally suggests something like a money note.

In everyday use, it refers to a banknote, not a coin. A coin would be monero.

Esperanto has no indefinite article. So there is no separate word for a/an.

• monbileto can mean a banknote
• depending on context, it can sometimes also be understood more generally as the banknote, but if you specifically want the, Esperanto uses la

So you could say:

• Mi deponis monbileton hieraŭ. = I deposited a banknote yesterday.
• Mi deponis la monbileton hieraŭ. = I deposited the banknote yesterday.

English requires an article much more often than Esperanto does.

Hieraŭ is an adverb meaning yesterday, so it does not need the noun ending -o or the direct-object ending -n in this sentence.

It simply tells you when the action happened:

• Mi deponis monbileton hieraŭ. = I deposited a banknote yesterday.

Esperanto often uses adverbs of time this way without any extra marking.

You may sometimes see an -n used with time expressions in Esperanto, but here hieraŭ works perfectly as a plain adverb.

Yes. Esperanto word order is fairly flexible, because endings show the grammatical roles clearly.

These are all natural:

• Mi deponis monbileton hieraŭ.
• Hieraŭ mi deponis monbileton.
• Mi hieraŭ deponis monbileton.

The most neutral order is often similar to English, but moving hieraŭ can slightly change emphasis. For example:

• Hieraŭ mi deponis monbileton. emphasizes yesterday

In Esperanto, the verb shows tense, but usually not person. So deponis only tells you that the action happened in the past, not whether it was I, you, or they.

That is why the subject pronoun is normally included:

• Mi deponis = I deposited
• Vi deponis = you deposited
• Ili deponis = they deposited

So mi is needed here to show who performed the action.

Yes, monbileton is singular.

Here is the breakdown:

• monbileto = banknote
• monbileton = a banknote, as a direct object

To make it plural, add -j:

• monbiletoj = banknotes
• monbiletojn = banknotes, as a direct object

So:

• Mi deponis monbiletojn hieraŭ. = I deposited banknotes yesterday.

Usually deponi means to deposit, to place, or to put down in a fairly formal or practical sense. The exact meaning depends on context.

In a sentence with monbileton, many learners will understand it as depositing a banknote, possibly into a bank account or as a formal deposit. But context matters.

For example, Esperanto speakers might also use enmeti, meti, or a more specific banking expression depending on the situation.

So deponi is a good general verb for deposit, but if you want to be very precise, more context may be needed.

Yes, if the context already makes the object clear.

For example:

• Mi deponis hieraŭ. = I deposited yesterday.

That is grammatically fine, but it sounds less complete unless the listener already knows what was deposited.

In the original sentence, monbileton gives the missing information and makes the statement more specific.