"Mara is a great warrior."
Translation:SuvwI' Dun ghaH mara'e'.
Klingon uses three equivalency formulas. In all cases where I say "noun", noun phrases can also be also used. Here are the basic concepts of these formulas:
1) noun = adjective
2) noun = noun
3) noun = at/in/on/by location
In English we use the connecting verb "to be" for the equals sign:
1) My friend is happy.
2) My friend is a Klingon.
3) My friend is on Kronos.
In English we can substitute a pronoun in place of the noun:
1) He is happy.
2) He is a Klingon.
3) He is on Kronos.
In Klingon, for the first kind of sentence, we don't use a connecting verb like "to be". The adjectives are already verbs and so we just use the verb as a verb. In Klingon we can leave the subject out, put in an explicit pronoun, or put in an explicit noun (we are not allowed to use both a noun and a pronoun at the same time):
1) Quch. ("He is happy.") Quch ghaH. ("He is happy.") Quch jupwI'. ("My friend is happy.")
However, for the other two formulas, Klingon does use a connector, but it doesn't have a verb for "to be". Instead Klingon uses a pronoun where the connecting verb would go. The pronoun also changes depending on who the subject is:
2) tlhIngan ghaH. ("He is a Klingon.") tera'ngan jIH. ("I am a Terran.") SuvwI' chaH. ("They are warriors.")
3) Qo'noSDaq ghaH. ("He is on Kronos.") DujDaq 'oH. ("It is on the ship.") Qe'Daq tlhIH. ("You are at the restaurant.")
In all of those sentences, the pronoun is acting like both the subject and verb. In fact, the pronoun, when used this way, and only when used this way, can actually take some verb suffixes. Since the pronoun is required to act as the connecting verb, you cannot substitute a noun in its place - the connecting "verb" must be a pronoun. You also cannot add a pronoun or a noun where the subject would normally go (like you could with formula 1) since the pronoun is acting as both the subject and the verb and we are not allowed to use both a pronoun and a noun for the subject.
So, if we want to be explicit as to who the "he", "it", "they", etc. are, we are unable to place a normal subject noun in the sentence. Instead we add it in as a topic, using the suffix -'e':
2) tlhIngan ghaH jupwI''e'. ("As for my friend, he is a Klingon." or "My friend is a Klingon.") SuvwI' chaH jaghpu''e'. ("As for the enemies, they are warriors." or "The enemies are warriors.")
3) Qo'noSDaq ghaH jupwI''e'. ("As for my friend, he is on Kronos." or "My friend is on Kronos.") DujDaq 'oH paq'e'. ("As for the book, it is on the ship." or "The book is on the ship.")
Whenever you are using a pronoun as the connecting verb AND you have an explicitly stated subject noun, you are required to use the -'e' suffix on the subject noun (because it's not really grammatically the subject, but rather the topic). That is the only time the -'e' suffix is required. All other uses of -'e' are optional.