Hello I am glad you are interested in the Georgian language. გამარჯობა, it's a little bit hard to explain, because it just means hello and it doesn't include personal pronouns inside. The word comes from the word :D გამარჯვება, which means victory. [-ობ- kinda expresses the present tense marker] --------- გა-გ-ი-მარჯ-ო-ს But, what about the " გაგიმარჯოს" it do includes the personal pronoun marker inside. * გა- in the beginning is the prefix. * -გ- it is the second person marker. (you) * -ი- is the additional vowel. * მარჯ - it is the root of the word. * -ს- I am not sure exactly, but from the word, we can consider that it expresses the singular. ------------------ გა-გ-ი-მარჯ-ო-თ We add the last "თ" in the ending, because "თ" expresses the plural form in the verbs. For example: შენ გინდა = you want / თქვენ გინდათ = you want (plural) And when we want to be formal or polite, we usually use the plural form for that. This is why we add the last "თ" in the ending, when we want to be formal or polite. I hope my answer helped you a little bit at least to find out how the word s grammar looks like in the behind :)

გამარჯობა-თ is not grammatically correct form. In Georgian we use the ending "-თ" to express politeness or when we refer to several people but the word გამარჯობა doesn't have a plural neither more polite form. Even native speakers make this mistake. In every situatian greeting must sound like გამარჯობა/გაგიმარჯოს. You can even forget about გაგიმარჯოს and answer back გამარჯობა too, it's also correct and more common actually. Everything else is already explained as I see.

thanks for your advice,I will try know more sentence and vocabularies :)

The only thing I would suggest for a beginner is nearly ignoring grammar, not going in-depth, till the time when you have learnt at least decent amount of nouns (არსებითი სახელები) and verbs (ზმნები) so that you are able to express yourself and somehow describe things around you. Grammar requires applying sufficient number of parts of speech, so it's a quite futile to start building a skeleton without a spine. As for me, vocabulary is like a draft, whilst grammar is colours/peculiarities. It's always better to make a draft first, but finish with adding colors. People usually loose their religion over struggling with the boring subsidiary edges of a language like grammar, pronunciation etc. P.S.: Don't hesitate messaging me whether you've got some questions related to Georgian and best of luck with its studying.