Learn Hardcore Greek: Διαβάζω το σημείωμα και τότε νιώθω πιο ήρεμος.

Without context, it usually sounds like a typical/repeated situation. To talk about a one‑off past event, Greek normally switches to the aorist (see next question).

How would I say I read the note and then I felt calmer (one specific time in the past)?

You would normally use the aorist (simple past):

Διάβασα το σημείωμα και τότε ένιωσα πιο ήρεμος.

Here:

διάβασα = I read (once, completed)
ένιωσα = I felt (once, completed)

This clearly puts the sentence in past time and presents the actions as single, completed events, rather than a general habit.

Where is the subject “I” in this sentence? Why don’t we see εγώ?

Greek is a pro‑drop language: subject pronouns are usually omitted because the verb ending shows the subject.

διαβάζω = I read / I am reading
νιώθω = I feel / I am feeling

Since -ω is the 1st person singular ending, it’s already clear that the subject is I.

You use εγώ only when you want emphasis or contrast:

Εγώ διαβάζω το σημείωμα και τότε νιώθω πιο ήρεμος.
I read the note (as opposed to someone else) and then I feel calmer.

What does το before σημείωμα do? Can I leave it out?

το is the definite article (the). It tells us we’re talking about a specific, known note:

το σημείωμα = the note

Grammatically:

το is neuter, singular, nominative/accusative article.
σημείωμα is a neuter noun, so it uses το.
In this sentence, το σημείωμα is the direct object of διαβάζω, so it’s in the accusative (but neuter nominative and accusative look the same: το σημείωμα).

You normally do not drop the article with singular countable nouns in Greek.
Compare:

Διαβάζω το σημείωμα. = I read the note.
Διαβάζω ένα σημείωμα. = I read a note.
Διαβάζω σημείωμα. – sounds incomplete/odd in most contexts.

So in this sentence, το is needed.

What exactly does σημείωμα mean? Are there other common words for note?

σημείωμα usually means a short written message / note:

a brief message left for someone
a short written notice, memo
sometimes a teacher’s note, a slip, etc.

Related words:

σημείωση
- a note / annotation / footnote (e.g. in a book, on slides)
- a remark / comment
- in plural σημειώσεις: notes (like class notes, study notes)

Examples:

Μου άφησε ένα σημείωμα στο τραπέζι.
He/She left me a note on the table.
Κρατάω σημειώσεις στο μάθημα.
I take notes in class.

In your sentence, το σημείωμα is a specific written note/message.

How does πιο ήρεμος express calmer? Is πιο like more?

Yes. The usual way to form the comparative in Greek is:

πιο + positive adjective

So:

ήρεμος = calm
πιο ήρεμος = more calm → calmer

Other examples:

πιο γρήγορος = faster / more quick
πιο ενδιαφέρον = more interesting
πιο δυνατός = stronger

Some very common adjectives have special comparative forms (not with πιο):

καλός → καλύτερος (good → better)
κακός → χειρότερος (bad → worse)
μεγάλος → μεγαλύτερος (big → bigger)

But ήρεμος forms its comparative with πιο: πιο ήρεμος.

Would this change if the speaker is a woman or if I’m talking about something else (like a child or a room)?

Yes. Adjectives in Greek agree with the gender and number of the noun/pronoun they describe.

Forms of ήρεμος:

Masculine: ήρεμος
Feminine: ήρεμη
Neuter: ήρεμο

So:

Male speaker: Νιώθω πιο ήρεμος.
Female speaker: Νιώθω πιο ήρεμη.
About a child (neuter): Το παιδί νιώθει πιο ήρεμο.
About a room (neuter): Το δωμάτιο είναι πιο ήρεμο.

And in the plural:

νιώθουμε πιο ήρεμοι (group of men / mixed group)
νιώθουμε πιο ήρεμες (group of women)
τα παιδιά είναι πιο ήρεμα (the children are calmer)

So in your sentence, πιο ήρεμος implies a male speaker. A woman would say πιο ήρεμη.

Could I say νιώθω πιο ήρεμα instead of νιώθω πιο ήρεμος?

That’s a subtle but important difference:

ήρεμος → adjective = calm (describes a state)
ήρεμα → adverb = calmly (describes manner)

With νιώθω + adjective, you describe your state:

Νιώθω πιο ήρεμος / ήρεμη.
I feel calmer (I am in a calmer state).

Νιώθω πιο ήρεμα is possible in Greek, but it tends to describe how you feel/behave, like I feel in a calmer way, focusing more on the manner than on your state as a property. For learners, when talking about feelings as states, it’s safer and more natural to stick with the adjective:

νιώθω πιο ήρεμος / ήρεμη

Can I use αισθάνομαι instead of νιώθω? Is there a difference?

You can, and the meaning here is essentially the same:

Διαβάζω το σημείωμα και τότε αισθάνομαι πιο ήρεμος.

Both νιώθω and αισθάνομαι mean I feel and are often interchangeable, especially with emotions and physical sensations.

Nuances:

νιώθω:
- very common, neutral, everyday
- used for both physical and emotional feeling
αισθάνομαι:
- a bit more formal or introspective in tone
- often used in more careful speech or writing
- also common in expressions like αισθάνομαι ότι… (I feel that…)

In your sentence, either verb works fine.

What is the role of τότε, and can I move it or replace it with μετά?

τότε is a temporal adverb meaning then / at that time. Here it marks the next step in time:

…και τότε νιώθω πιο ήρεμος.
…and then I feel calmer.

You can replace it with μετά (after(wards)), with a slightly different nuance:

Διαβάζω το σημείωμα και μετά νιώθω πιο ήρεμος.
Suggests after that in a more general sense; τότε often sounds a bit more like right then / at that moment.

You can also move τότε, though the original position is the most natural:

Διαβάζω το σημείωμα και νιώθω τότε πιο ήρεμος. – grammatical, but less common; slight emphasis on then.
Τότε διαβάζω το σημείωμα και νιώθω πιο ήρεμος. – At that time I read the note and I feel calmer (focus on that time).

About punctuation: Greek normally does not put a comma before και when it simply connects two verbs with the same subject, so:

Διαβάζω το σημείωμα και τότε νιώθω πιο ήρεμος.

is punctuated correctly without a comma before και.