Let's join the lesson

I would say:
Intereamus disciplina

Gratias, George

Hw about "Good morning, class! Today we're gonna learn Calculus"
and.... "Have a nice day"

Tq

The literal translation of "good morning" is "bonum matutinum", but the
Latin greeting that would be used is "salve" (singular) or "salvete" (plural).
I don't know of any Latin equivalent to "class" as a group of students, so would
just say "students".

Note that "calculus" is the Latin word for a little stone. But the context should
make the meaning clear.

The literal translation of "have a nice day" is "habe diem suavem", but the
Latin greeting that would be used is "vale".

So . . .

Salvete, discipuli! Hodie Calculum discemus.

Valete!

Gratias, George

How do I say "Good morning, Honey" ?
==> "Salve .....?"
Hw about "Good afternoon, Good day, Good evening, Good night, How are you?, You're welcome" ?

Tq

"Good morning, Honey"
Salve, mel (or melculum) meum
As we discussed before, the Latin greeting is typically Salve and the Latin
farewell is typically Vale, regardless of the time of day.

The literal translations of the following are:
Good afternoon -- Bonum postmeridianum tempus
Good day -- Bonus dies
Good evening -- Bonus vesper
Good night -- Bona nox

The Latin phrases used for "How are you" and "You're welcome" are:
How are you? -- Quid agis?
You're welcome -- Salutatio

Gratias, George

"meus = my ?"
"Ego sum teres , gratias ago vos = I'm fine, thank you ?"
"Bonus fortuna , mellis = Good luck, Honey ?"


Gratias ago vos summopere

"Meus" means "my". However, it agrees with the noun it modifies in case,
number and gender. "Meus" is the nominative singular masculine.

"Ego sum teres , gratias ago vos = I'm fine, thank you ?"
The pronoun "ego" is most often omitted as understood.
"Sum" means "I am".
"Teres" means "fine" in the sense of polished or elegant.
"Gratias ago" means "I thank", but it takes the dative. So use "vobis" rather
than "vos". Note that "vobis" or "vos" is plural. The singular would be "tibi".

"Bonus fortuna , mellis = Good luck, Honey ?"
"Bonus" means "good", but is the masculine gender. To agree with "fortuna",
which is feminine, use "bona".
"Mellis" means "of honey". It is the genitive case. You want the vocative, "mel".

Gratias ago vos summopere
See above about "vos".

You're welcome (Salutatio!).

Gratias, George....
I'm curious, where r u from?

Fui fun = have fun...?
How's vestri schola? = How's ur school?
Have a dulcis somnium = have a sweet dream ...?
Have a bonus somnus = have a good sleep ....?
Adepto nonnullus sileo = get some rest ...?

I grew up in East Boston, Massachusetts.
I learned my Latin at Savio High in East Boston, Sacred Heart Juniorate in
Ipswich, and Don Bosco College in Newton, New Jersey.

And you?

These look like they came from an online automated translator.
"How's" and "Have a", for example, are obviously not Latin.