The Indefinite Subject Suffix -lu’
The Type 5 verb suffix -lu’ indefinite subject has special grammatical rules, as outlined in The Klingon Dictionary.
Here is the writeup, from TKD:-
This suffix is used to indicate that the subject is unknown, indefinite, and/or general. Since the subject is always the same (that is, it is always unstated), the
pronominal prefixes are used in a different way. Those prefixes which normally indicate first- or second-person subject and third-person singular object (vI-, Da-, wI-, bo-) are used to indicate first- or second-person object. Thus, vI-, which normally means I do something to him/her, when in a verb with -lu' means someone/something does something to me.
Similarly, the prefix lu-, which normally means they do something to him/her, becomes someone/something does something to them.
Daqawlu' someone/something remembers you (qaw remember)
wIleghlu' someone/something sees us (legh see)
Soplu' someone/something eats it (Sop eat)
Verbs with -lu' are often translated into the English passive voice.
Daqawlu' you are remembered
wIleghlu' we are seen
Soplu' it is eaten
When used with the verb tu' find, observe and a third person singular subject pronoun (0), the resulting verb form tu'lu' someone/something finds it is often
translated by English there is.
naDev puqpu' tu'lu' there are children around here, someone/something finds children here
One of the first instances of -lu’ came all the way back in Star Trek III: The Search for Spock:-
batlh Daqawlu’taH You will be remembered with honour (Kruge to Valkris (Note: she is))
Other examples of -lu’ from Star Trek: Discovery:-
jav wen DujlIj Qotlhlu' 'ej tagh noH It has been six months since your ship was disabled and the war began
DujlIj Qotlhlu’ your vessel was disabled
chuqmajDaq Senjaw tu'lu' Shenzhou is within our range
chuqmajDaq within our range
Senjaw tu'lu' there is the Shenzhou
QuQmaj DIchu'qa'meH toQDuj wIpoQbogh tu'lu'be' We have no Birds of Prey to jump-start our engines
QuQmaj DIchu'qa'meH In order to reactivate our engines
toQDuj wIpoQbogh the Birds of Prey that we require (toQDuj Bird of Prey)
lonlu'bej, 'a naQtaH cha'puj choHmeH bobcho'Daj It may have been abandoned, but it still has an intact dilithium-processing unit
lonlu'bej It has certainly been abandoned (lon abandon (v))
cha'puj choHmeH bobcho'Daj dilithium processing unit (cha’puj dilithium, choH change, alter, bobcho’Daj their module)
‘a naQtaH but it remains intact