If commenting an article, is it right to use past tense to describe what the author has written (verb) and use present tense to describe adjective?
Example 1: The study exhibited the motivation of the study by quoting contemporary business environment issues.
Example 2: The research questions and research objectives are consistent and reflected the problem statement.
I don't know what you mean by "reflected the problem statement." One thing is certain: it does not sound right. Perhaps you meant to say "deal with / address the problem stated."
Leaving that aside, I'd say that example (2) does not sound right with present and past. I'd use the present for both verbs.
The choice of present or past may depend on whether you want to make your description sound more vivid (present) or like a more distant account of a past study.
Is there any role to use past tense or present tense when reviewing or commenting an article? Is that when we use present tense, then through out the writing must use present tense?
Location: Sacramento, California
If commenting an article
when reviewing or commenting an article
The phrase to use, Joshua, is "commenting on
an article." It's ungrammatical to speak of "
commenting an article
" or "
." The preposition is needed. Note that we also use "on" (or "about") in "make a comment on
something," as in "He made a number of comments on / about