Χτες έσπασα ένα πιάτο, αλλά σήμερα προσέχω πολύ για να μη σπάσω τίποτα άλλο.

Yes. Χτες and χθες both mean yesterday.

• χθες is the more traditional spelling
• χτες is a very common modern spelling that reflects the actual pronunciation more closely

In everyday Greek, learners will see and hear both. Χτες is very natural in speech and informal writing.

Έσπασα is the aorist past form of σπάω / σπάζω (to break). It means I broke: a completed action in the past.

So:

• έσπασα = I broke
• σπάω / σπάζω = I break / I am breaking
• σπάσω = (that) I break / to break in certain structures like να σπάσω

In this sentence, χτες refers to a completed event yesterday, so Greek uses the aorist past: έσπασα.

Greek usually does not need subject pronouns like I, you, he, we, because the verb ending already shows the subject.

For example:

• έσπασα = I broke
• προσέχω = I am careful / I’m being careful
• σπάσω = I break in the subjunctive structure

You can add εγώ (I) for emphasis, but it is normally omitted.

Ένα πιάτο means a plate / one plate.

Greek often uses the indefinite article where English does:

• ένα πιάτο = a plate

If you just said έσπασα πιάτο, it would sound unnatural in standard Greek. The article is normally expected here.

Because the speaker is contrasting yesterday with today:

• Χτες έσπασα ένα πιάτο = yesterday I broke a plate
• αλλά σήμερα προσέχω πολύ = but today I’m being very careful

Προσέχω is present tense because it describes what the speaker is doing today / now.

Also, προσέχω can mean:

• I pay attention
• I am careful
• I watch out

Here it means I’m being careful.

Πολύ means a lot / very much.

In προσέχω πολύ, it means I’m being very careful or more literally I pay a lot of attention.

Greek word order is fairly flexible, but this placement is very natural:

• προσέχω πολύ = I’m very careful / I’m being very careful

You could move πολύ in some contexts, but the given order is the most straightforward and idiomatic.

Για να usually means in order to or so that.

In this sentence:

• για να μη σπάσω τίποτα άλλο = so that I don’t break anything else

It introduces a purpose:

• I am being very careful so that I do not break anything else.

This is a very common Greek structure:

• διαβάζω για να μάθω = I study in order to learn
• φεύγω νωρίς για να προλάβω = I leave early so that I make it in time

Because after για να, Greek uses the subjunctive, and negative subjunctive takes μη(ν), not δεν.

So:

• δεν negates ordinary statements:
  δεν σπάω = I am not breaking / I don’t break
• μη negates subjunctive or non-indicative forms:
  να μη σπάσω = that I not break / so that I don’t break

Since για να is followed by a subjunctive structure, μη is the correct negative word.

Σπάσω here is the aorist subjunctive form of σπάω / σπάζω.

After να, Greek uses a subjunctive form rather than a normal present or past indicative form.

So:

• να σπάσω = for me to break / that I break
• να μη σπάσω = that I not break / so that I don’t break

Why the aorist subjunctive here? Because the speaker means a single possible event: breaking something. It is not about an ongoing process, but about avoiding one incident.

In Greek, τίποτα can mean either:

• nothing in some contexts
• anything after negation

Here, because of μη, it means anything:

• να μη σπάσω τίποτα άλλο = so that I don’t break anything else

This is normal Greek negative syntax. English often uses anything after negation; Greek often uses forms like τίποτα, κανείς, ποτέ with a negative marker.

Examples:

• Δεν είδα τίποτα. = I didn’t see anything.
• Μη φας τίποτα. = Don’t eat anything.

Άλλο means other / else / another, depending on context.

In τίποτα άλλο, it means anything else.

So the idea is:

• I already broke one plate yesterday
• today I’m careful so I won’t break anything else

Without άλλο, the sentence would simply mean so that I don’t break anything. With άλλο, it clearly connects to the earlier broken plate.

No. That is not correct Greek.

After για να, you need a subjunctive structure:

• για να σπάσω
• για να μη σπάσω

You do not use δεν there.

So the correct sentence is:

• για να μη σπάσω τίποτα άλλο

Because both forms exist in Modern Greek.

Many verbs have two present-tense variants, and σπάω / σπάζω is one of them. Both mean to break.

You may see forms such as:

• σπάω
• σπάζω

But the aorist is:

• έσπασα

And the subjunctive aorist:

• να σπάσω

So even if the dictionary gives σπάζω, forms like έσπασα and σπάσω are completely expected.

It is natural and correct to use the comma here because the sentence joins two clauses with αλλά (but):

• Χτες έσπασα ένα πιάτο, αλλά σήμερα προσέχω πολύ...

The comma helps mark the contrast clearly:

• yesterday I broke a plate,
• but today I’m being very careful...

In writing, this punctuation is standard and helpful.

Yes, Greek word order is more flexible than English, but the original order is very natural.

For example, you might also hear:

• Χτες έσπασα ένα πιάτο, αλλά σήμερα πολύ προσέχω...
  This sounds marked or stylistically unusual.
• Σήμερα προσέχω πολύ για να μη σπάσω τίποτα άλλο.
  Also correct.

The original version is the most neutral and natural:

• Χτες έσπασα ένα πιάτο, αλλά σήμερα προσέχω πολύ για να μη σπάσω τίποτα άλλο.

The given sentence already sounds natural. A few small variations are also common, for example:

• Χτες έσπασα ένα πιάτο, αλλά σήμερα προσέχω πολύ μην σπάσω τίποτα άλλο.

In casual speech, people often shorten για να μη to μην in this kind of idea, especially when the meaning is clearly so that I don’t.

But for learners, the original version is excellent because it clearly shows the structure:

• για να + subjunctive
• μη for negation
• σπάσω as the subjunctive form