Τα χείλη μου είναι ξηρά σήμερα.

A word-by-word breakdown is:

• Τα = the
• χείλη = lips
• μου = my
• είναι = are
• ξηρά = dry
• σήμερα = today

So the literal order is the lips my are dry today, but the natural English translation is My lips are dry today.

This is very normal in Greek. With body parts, family members, and many personal possessions, Greek often uses the definite article together with the possessive:

• τα χείλη μου = my lips
• το χέρι μου = my hand
• η μητέρα μου = my mother

So even though English does not use the here, Greek usually does.

In Greek, the weak possessive forms like μου, σου, του, της usually come after the noun:

• τα χείλη μου = my lips
• το βιβλίο μου = my book

That is the standard pattern. If you want stronger emphasis, Greek can use δικός:

• τα δικά μου χείλη = my own lips

But in a normal sentence, τα χείλη μου is the natural form.

The singular is το χείλος.

So:

• το χείλος = lip
• τα χείλη = lips

A learner should also know that χείλος can sometimes mean edge or rim as well, not only the lip of the mouth.

Because adjectives in Greek agree with the noun they describe.

Here, χείλη is:

• neuter
• plural
• nominative

So the adjective must also be neuter plural:

• ξηρός = masculine singular
• ξηρή = feminine singular
• ξηρό = neuter singular
• ξηρά = neuter plural

So τα χείλη μου είναι ξηρά is correct because χείλη is neuter plural.

Here it means are, because the subject τα χείλη μου is plural.

A useful thing to know is that in the present tense, Greek uses the same form είναι for both:

• he/she/it is
• they are

So you understand it from the subject:

• Το παιδί είναι μικρό. = The child is small.
• Τα παιδιά είναι μικρά. = The children are small.

Yes. That is also natural Greek.

Both of these work:

• Τα χείλη μου είναι ξηρά σήμερα.
• Έχω ξηρά χείλη σήμερα.

The difference is small:

• Τα χείλη μου είναι ξηρά focuses more directly on my lips
• Έχω ξηρά χείλη is more like I have dry lips

Both are common and correct.

Not exactly. ξηρά means dry.

If you specifically mean chapped or cracked, Greek often uses words like:

• σκασμένα χείλη = chapped/cracked lips

So ξηρά χείλη means the lips are dry, but it does not automatically mean they are badly cracked.

No. Greek word order is fairly flexible.

All of these are possible:

• Τα χείλη μου είναι ξηρά σήμερα.
• Σήμερα τα χείλη μου είναι ξηρά.

The second version puts a bit more attention on today. The version with σήμερα at the end is very natural and neutral.

No. Greek usually does not need an explicit subject pronoun when the meaning is clear.

So Greek says:

• Τα χείλη μου είναι ξηρά.

It does not need a separate word for they. The subject τα χείλη μου is already there, so that is enough.

A simple approximation for an English speaker is:

• χείλη ≈ HEE-lee
• μου ≈ moo
• είναι ≈ EE-ne
• ξηρά ≈ ksee-RA
• σήμερα ≈ SEE-me-ra

One detail: the χ in χείλη is not exactly an English h. It is a softer Greek sound, similar to the German ich sound. But HEE-lee is a good beginner approximation.