G'mar Tove means to "finish well". It is a greeting for Yom Kippur.
Finish
If you mean the Tov, it is "good". There is no such word as Tobe in Hebrew.
diploma = te'udat gmar (תעודת גמר) diplomas = te'udot gmar (תעודות גמר)
Maya Tov means "A good Maya". BUt I think you might be asking about Mazal Tov (מזל טוב) which means "congratulations."
Those two words, literally translated from Hebrew, would mean "good, thanks".
Chodesh Tov means "have a good month" and is the traditional greeting used on Rosh Chodesh.
hu hag tov (הוא חג טוב) means "it is a good holiday". It is a line from a Hanukkah song.
tone of voice
It means 'Good morning'
it means good sign
Siman tov u'mazal tov v'siman tov u'mazal tov, siman tov u'mazal tov v'siman tov u'mazal tov, siman tov u'mazal tov v'siman tov u'mazal tov, y'hey lanu. Y'hey lanu, y'hey lanu, u'l'khol Yis'ra'iel, y'hey lanu, y'hey lanu, u'l'khol Yis'ra'iel, y'hey lanu, y'hey lanu, u'l'khol Yis'ra'iel, y'hey lanu, y'hey lanu, u'l'khol Yis'ra'iel.
Shem Tov ibn Shem Tov died in 1440.