So let's begin.
tark /tak/ - stop; cease motion and/or action.
This is the basic verb form which is then inflected for tense and number, or to form adjectives and adverbs
It is also the first of the first person singular forms:
tark = I stop
It is used as a command because without an object it implies that the listener, any listener, is the one being stopped by the speaker.
Any tense which implies that the action is happening at the time being described adds the first vowel of the verb as a suffix. Thus:
tarka = I am stopping
To get a future tense you add the second suffix –yu /ju/. Thus you get:
tarkyu = I will stop
tarkayu = I will be stopping
To get an intentional tense you add yu as a prefix. Thus:
yutark = I plan to stop
yutarka = I am planning to stop
yutarkyu = I will plan to stop
yutarkayu = I am going to be stopping/I am planning to be stopping
To get a past tense you add the suffix –ow /aʊ/. Thus you have:
tarkow = I stopped
tarkaow = I was stopping
yutarkow = I planned to stop
yutarkaow = I was planning to stop
yutarkow = I had planned to stop
yutarkaow = I was going to be stopping/I was planning to be stopping
Before leaving verbs, it must be mentioned that tark- is used as a prefix on verbs to change the meaning to ceasing to do something. Thus you can have:
tarktark = I stop stopping or I am ceasing to stop.
A mechanism that stops something can be a tarkud, from tark and the element –ud /ʌd/ meaning a thing, particularly a mechanical thing meant to do something. Tarkud is the word normally used for a brake.
Something which has recently stopped is described as being tarkamen, from tarka and –men /mɛn/ which is used to form non-superlative, non-comparative descriptors. An object, and particularly a person, at rest however, is not described being tarkmen as this implies all function has ceased forever and it is, in fact, slang for someone being dead.