"Is her name Mara?"
Translation:mara 'oH'a' pongDaj'e'?
This Skill (that's what the units of lessons are called in Duolingo) simply introduces you to some basic sentences to memorize. As you go along the Tips will introduce more and more of the grammar so you can understand how these sentences are put together. The Tips for this Skill does have a brief note about Word Order. Typically the word order is Object-Verb-Subject, which can often seem the reverse of English. This sentence is a very special kind of sentence and actually uses the word order Object-Pronoun-Topic, but for this special kind of sentence, the "pronoun" is acting like a "verb" and the "topic" is acting like a "subject", so it's very similar to Object-Verb-Subject.
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The interrogative -'a' goes on the verb and this syllable means something different on nouns. When using the interrogative verbal -'a', it does not go at the end of the sentence, but rather at the end of the verb (which is often in the middle of the sentence). Notice that there is an -'a' on 'oH which is acting like a verb in this sentence. This sentence is written correctly.
The -'e' suffix goes on nouns and often marks emphasis, focus, or topic. In most cases it is completely optional and can go on either the object or the subject. However, when using a pronoun as the verb "to be" ('oH in this case), there is a grammatical rule that says if you state the subject that the pronoun is referring to (pongDaj in this case) then you MUST mark it with -'e':
mara 'oH'a' "Is it Mara?"
mara 'oH'a' pongDaj'e' "Is her name Mara?"
My answer is going to contain complicated grammar that I'm not going to bother explaining here. You will eventually learn all this. But for now I want to show you that Klingon has ways to indicate some of the variations that English also has.
To ask, "Is your name Mara?" you would say, mara 'oH'a' ponglIj'e'?
To ask, "Mara, is this your name?" you would say mara, ponglIj 'oH'a'?