I think enough of the serious discussion about grammar. 🙂 🙂
Let’s start with simple sentences. Before starting I want to clarify a few things.

• Examples given below follow the rules we have discussed so far. So grammar is not explained again. I would request you to read each sentence carefully and identify how the form of a particular word or verb is created.
• Wherever a new concept or exception is introduced, I will try to explain it there.
• Please note the Marathi translation may not be an exact word-to-word translation.
  e.g. when asking about someone’s height in English we say “How long are you?“ but Marathi sentence will be similar to asking “What is your height”. So you should sense the difference.
• You know that form of verb changes depending on gender and multiplicity.
  So wherever applicable I have mentioned gender in brackets followed by the corresponding version of the sentence.
• Because of British rule in India, English is learned and used widely throughout India. So the use of English words is quite common. In many cases, English words are natural choice than original Marathi words !!
• In Marathi to say something with respect, the sentence is formed using the plural.
  In English when telling about a friend you will say, “He goes to work”. While speaking about an elderly person with respect you will still say “He goes to work”. But in Marathi second sentence (with respect) will form like saying “They go to work”.
  To Indicate this I have marked such sentence as “To Man” or “To Lady”. So these are “with respect” versions.

So below I have given a few sentences which will answer questions like How to welcome guests in Marathi”, “How to speak with guests in Marathi” etc.

Let’s start

1) Good morning/evening/night:
In Marathi, there is no custom of greeting this way i.e. depending on time. Formally people great each other saying नमस्कार (namaskAr) / नमस्ते (namaste). But due to widespread knowledge of western culture; even Marathi people great each other in western may like saying “hi,” hello”,” how are you”, “Good morning/evening/night” in English.

2) Welcome:
(In formal Marathi ) सुस्वागतम (susvAgatam)
(In day to day use) या या (yA yA )

3) How are you:
(to the boy) तू कसा आहेस (tU kasA Ahes)
(to the girl) :- तू कशी आहेस (tU kashI Ahes)
(to the man with respect) :- तुम्ही कसे आहात (tumhI kase AhAt)
(to the lady with respect) :- तुम्ही कश्या आहात(tumhI kashyA AhAt)

4)How do you do:
(to boy) :- तू काय म्हणतोस (tU kAy mhaNatos)
(to girl) :- तू काय म्हणतेस (tU kAy mhaNates )
(to man/lady with respect) :- तुम्ही काय म्हणता (tumhI kAy mhaNatA)

5) I am fine:
मी मजेत आहे (mI majet Ahe)
I am ok :- मी ठीक आहे ( mI ThIk Ahe)
(A boy or man can say) मी बरा आहे (mI barA Ahe) / (A girl or lady can say) मी बरी आहे (mI barI Ahe)

6) Long-time no see:
(to boy) खूप दिवसात भेटला नाहीस (khUp divasAt bheTalA nAhIs)
(to girl) :- खूप दिवसात भेटली नाहीस (khUp divasAt bheTalI nAhIs)
(to man/lady with respect) :- खूप दिवसात भेटला नाहीत (khUp divasAt bheTale nAhIt)

7) Yes, I was very busy these days:
हो, हल्ली/आजकाल मी खूप व्यस्त/busy होतो (ho, hallI/AjakAl mI khoop vyast hoto)

8) Please have a seat:
(to boy/girl) :- बस (bas)
(to man/lady) :- बसा (basA)

9)Can you give me some water?

(to boy) मला थोडे पाणी देतोस/देशील का ? (malA thoDe pANI detos/deshIl kA ? )
(to girl) मला थोडे पाणी देतेस/देशील का ? (malA thoDe pANI detes/deshIl kA ? )
(to man/lady) मला थोडे पाणी देता/द्याल का ? (malA thoDe pANI detA/dyAl kA ?)

10) What would like ? Tea or Coffe ?: तुम्ही काय घेणार ? चहा की कॉफी ?

11) I will take tea: मी चहा घेईन (mI chahA gheIn )

12) Tea is fine for me: मला चहा चालेल (malA chahA chAlel )

13) No, Thanks: नको.Thanks. (nako)

14) No, I do not want anything: नको. मला काही नको (nako malA kAhI nako)

15) What do yo do these days?:
(to boy) :- सध्या काय करतो आहेस (sadhyA kAy karato Ahes )
(to girl) :- सध्या काय करते आहेस (sadhyA kAy karate Ahes )
(to man/lady with respect) :- सध्या काय करत आहात (sadhyA kAy karat AhAt)

16) I am studying in 10th standard (boy):
मी दहावीत शिकतो आहे (mI dahAvIt shikato Ahe)
I go to college (girl): मी कॉलेजात जाते (mI kolejAt jAte)

17) Where do you stay/live ?:
(to boy) :- तू कुठे राहतोस (tU kuThe rAhatos)
(to girl) :- तू कुठे राहतेस (tU kuThe rAhates)
(to man/lady with respect) :- तुम्ही कुठे राहता (tumhI kuThe rAhatA )

18) I live in Dombivli:
(boy) :- मी डोम्बीवलीत राहतो (mI DombIvalIt rAhato)
(girl) :- मी डोम्बीवलीत राहते (mI DombIvalIt rAhate)

19) What is your name:
(to boy/girl) :- तुझे नाव काय (tujhe nAv kAy)
(to man/lady) :- तुमचे नाव काय (tumache nAv kAy)

20) My name is Kaushik: माझे नाव कौशिक (mAjhe nAv kaushik)

21) Where do you work:
(to boy) तू कुठे काम करतोस (tU kuThe kAm karatos )
(to girl) तू कुठे काम करतेस (tU kuThe kAm karates)
(to man/lady) तुम्ही कुठे काम करता (tumhI kuThe kAm karatA )

22) How is everybody at home?: घरी सगळे कसे आहेत ?( gharI sagaLe kase Ahet )

23) Give my regards to uncle: काकांना माझा नमस्कार सांग (kAkAMnA mAjhA namaskAr sAMg)

24) Bye bye: Bye Bye / टा टा (TA TA)

25) See you again: See you परत/पुन्हा भेटू (parat/punhA bheTU ) / भेटुया (bheTuyA)

26) When will we see again: परत/पुन्हा कधी भेटणार (parat/punhA kadhI bheTaNAr )

27) What else: बाकी काय (bAkI kAy ?)

28) Ok: ठीक (ThIk) / ठीक आहे (ThIk Ahe)

29) (formally) It was nice to meet you: तुम्हाला भेटून आनंद झाला(tumhAlA bheTUn AnaMd jhAlA) / (to someone more familiar) It was nice to meet you-> तुम्हाला भेटून बरं वाटलं (tumhAlA bheTUn baraM vATalaM )

30) It was nice to hear that: हे ऐकून बरं वाटलं की (he aikUn baraM vATalM kI) / हे ऐकून आनंद झाला की (he aikUn AnaMd jhAlA kI)

31) It was nice to see that: हे बघून बरं वाटलं की (he baghUn baraM vATalM kI) / हे बघून आनंद झाला की (he baghUn AnaMd jhAlA kI )