So, could someone write a few examples, where aspect is being used as tense, as an example of what to actually avoid ?

You can look at "imperfect" tenses. English doesn't have them as a verb form, but lots of other languages do. I think Greek does.

naH jajmeywIj bIQ'a' HeHDaq jIyIt
In my youth I walked on the beach.

My intention here is to imply that I used to walk on the beach; it was my habit to walk on the beach in my youth. Because we're not talking about a specific action that was finished, but a habit or tendency, this is imperfect. It is not describing a particular action I completed. If I said

naH jajmeywIj bIQ'a' HeHDaq jIyItpu'
In my youth I walked on the beach,

I would be saying that in my youth there was this one time when I took a walk on the beach, and completed the walk. It could not be used to refer to your habit of walking every day.

wa' ben Ha'DIbaH vISopbe'
I didn't eat meat last year.

This describes the general fact of my meatlessness last year, not any particular act of eating. It is not describing an action that is completed. If I said

wa' ben Ha'DIbaH vISopbe'pu'
I didn't eat the meat last year.

This would be referring to some instance in which I was offered meat and refused it. An occasion to eat meat arose, and I completed not eating it.

I always hesistate to refer to a Klingon verb with no type 7 suffix as imperfect, because it's not necessarily exactly what any other language means by the term, and the word doesn't say anything about continuousness. In English, a verb is often considered imperfect if it's in a progressive tense, and these are often reflective of continuous action. This is why I usually resort to the cumbersome non-perfective, non-continuous or some variation thereof.

One more, taken from early canon. Kruge says to Valkris,

vaj Daleghpu'
Then you have seen it.

He pitches it as a question without giving it an interrogative suffix, but that's not important. He's referring to an action Valkris did in the past and completed. If he had said

vaj Dalegh
Then you see it,

and if it wasn't taken as clipped Klingon, Valkris would probably take this as asking if she's looking at it right now. When not set in the past or future, a perfectiveless verb may be taken as occurring in the moment.

Exactly how you interpret a verb without a type 7 suffix depends heavily on the context of the sentence, but barring some exceptions it cannot be interpreted as a specific action that was actually completed.

-- 
SuStel
http://trimboli.name