Η φίλη μου λέει ότι ένα τοστ με ντομάτα και μαρούλι είναι αρκετό, αρκεί να είναι ζεστό.

In Greek, the unstressed possessive pronoun μου usually comes after the noun, so:

• η φίλη μου = my friend
• το βιβλίο μου = my book

Putting μου before the noun is not the normal pattern in everyday Modern Greek.

Also notice:

• η φίλη is the friend
• Greek often uses the definite article where English would not. So η φίλη μου literally looks like the friend my, but it simply means my friend.

Because φίλη means female friend. Greek nouns have grammatical gender, and here the gender matches the person being referred to.

Compare:

• ο φίλος μου = my male friend
• η φίλη μου = my female friend

So the article changes too:

• ο for masculine
• η for feminine
• το for neuter

ότι introduces a subordinate clause and means that.

So:

• λέει ότι... = she says that...

It connects the main verb λέει with the statement that follows.

A learner should also know that ότι is often interchangeable with πως in this use:

• Λέει ότι...
• Λέει πως...

Both can mean She says that...

Yes, τοστ is a very common word in Modern Greek, borrowed from English/French usage. In everyday Greek, τοστ usually means a toast sandwich or grilled sandwich, not just a slice of toasted bread.

It is treated as a neuter noun, so it takes:

• το τοστ = the toast sandwich
• ένα τοστ = a toast sandwich

Even though the word itself does not change form much, the article shows its gender and case.

In Greek, when listing ingredients or contents after με (with), it is very common to leave out the article.

So:

• ένα τοστ με ντομάτα και μαρούλι

means a toast sandwich with tomato and lettuce

This sounds natural because the speaker means the ingredients in a general sense, not a specific tomato or a specific lettuce.

You could sometimes hear articles in other contexts, but here article-less nouns are the normal choice.

Because αρκετό agrees with τοστ, which is neuter singular.

Greek adjectives must agree with the noun they describe in:

• gender
• number
• case

So here:

• τοστ = neuter singular
• αρκετό = neuter singular adjective

Compare:

• ο καφές είναι αρκετός = the coffee is enough
• η σαλάτα είναι αρκετή = the salad is enough
• το τοστ είναι αρκετό = the toast sandwich is enough

Here αρκετό means enough or sufficient.

So είναι αρκετό means:

• it is enough
• it is sufficient

It does not mean quite a lot in this sentence. It means that the sandwich is enough for the purpose being discussed.

αρκεί να is a very common expression meaning:

• provided that
• as long as
• on condition that

So:

• αρκεί να είναι ζεστό

means something like:

• as long as it is hot
• provided that it is hot

This expression is very useful in Greek and is followed by a να-clause.

Modern Greek does not use the infinitive the way English does. Instead, Greek usually uses a finite verb introduced by να.

So where English says:

• provided it is hot
• to be hot in some structures

Greek uses:

• να είναι

Here:

• είναι is the verb to be
• να marks the subordinate clause

This is one of the biggest structural differences between English and Greek.

Again, the adjective agrees with τοστ, which is neuter singular.

So:

• ζεστός = masculine
• ζεστή = feminine
• ζεστό = neuter

Because the thing that should be hot is ένα τοστ, Greek uses ζεστό.

Yes. είναι is the present-tense form of είμαι (to be).

However, after να, Greek grammar is often described in terms of subjunctive use, not just simple tense labels. In practical terms for a learner, it is enough to notice that:

• να
  • verb form

is the normal way to form many subordinate clauses in Modern Greek.

So να είναι is the natural form after αρκεί.

The comma separates the main statement from the condition that follows.

Main part:

• Η φίλη μου λέει ότι ένα τοστ με ντομάτα και μαρούλι είναι αρκετό

Condition:

• αρκεί να είναι ζεστό

In English, we often also separate this kind of extra condition with punctuation. The comma helps show that the second part adds a qualification: the sandwich is enough, provided that it is hot.

The subject is understood from the context: it is το τοστ.

Greek often leaves out words that are clear from context. Repeating the noun would be possible, but unnecessary.

So the full idea is:

• αρκεί να είναι ζεστό [το τοστ]

Since everyone already knows we are talking about the sandwich, Greek naturally omits it.

Yes, Greek word order is more flexible than English word order, although not all versions sound equally natural.

For example, the basic sentence could be rearranged a little for emphasis, but the original order is very normal and natural:

• Η φίλη μου λέει ότι ένα τοστ με ντομάτα και μαρούλι είναι αρκετό, αρκεί να είναι ζεστό.

Greek often keeps a fairly neutral order like this in everyday speech, especially in longer sentences. If you move things around, you usually create emphasis or a slightly different tone rather than a completely different meaning.

It can mean both, depending on context.

Greek present tense often covers both:

• she says
• she is saying

So Η φίλη μου λέει ότι... could mean:

• My friend says that...
• My friend is saying that...

Usually the surrounding context tells you which English translation fits best.

Yes. After verbs like λέω, both ότι and πως are common.

So these are both natural:

• Η φίλη μου λέει ότι...
• Η φίλη μου λέει πως...

For a learner, the safest point is:

• both can mean that
• both can introduce reported speech or a statement after λέω

Just be careful not to confuse πως with πώς, which means how. The accent matters in writing:

• πως = that
• πώς = how

Most of the nouns here are in the nominative because they are subjects or predicate-related forms:

• Η φίλη μου — nominative, subject of λέει
• ένα τοστ — nominative, subject of είναι
• ντομάτα and μαρούλι — after με, these appear in the accusative form, but for these nouns the form is the same as nominative in this context

A useful detail for learners is that Greek articles often make case clearer than the noun ending itself. Here, because there are no articles before ντομάτα and μαρούλι, you mostly learn the structure as a whole:

• με + noun = with + noun

In many everyday phrases, the form may look unchanged, especially with some neuter nouns or certain feminine nouns.