Basically, a normal Klingon sentence has a main verb with no Type 9 verb suffix.

The Type 9 suffix {-jaj} is special, and a sentence with a verb with {-jaj} will not have a second verb with no Type 9 suffix. The only main verb will have {-jaj}, and the nouns might be moved around from their usual positions, because, hey, {-jaj} is special.

The Type 9 suffix {-‘a’} on the main verb turns a statement into a yes/no question. There will be no second verb in this sentence that lacks a Type 9 suffix…

Here's a completely tangential observation.

Type 9 suffixes do one of three things.

1. Turn a verb into a noun. -wI', -ghach.

2. Turn a verbal clause into a dependent clause. -bogh, -chugh, -DI', -meH, -mo', -pa', -vIS.

3. Change the mood of the sentence.
    -'a' gives the sentence the interrogative mood.
    -jaj gives the sentence the optative mood (thanks QeS).

-- 
SuStel
http://trimboli.name