Adverbs as short responses (definitely, certainly)
We often use some adverbs in speaking as short responses to show attitude or viewpoint: …

certainly | American Dictionary

certainly
adverb
us/ˈsɜr·tən·li/

certainlyadverb (KNOWING TO BE TRUE)

When said in answer to a question asking for help, certainly means yes:
"Can you give me a hand?" "Certainly."

Examples of certainly

certainly
An individual can make up her own language, certainly.
All of the topics are developed in considerable detail, involving a degree of extrapolation that is certainly courageous and perhaps foolhardy.
While nerve endings in the nose play a central role, the taste certainly is not there.
Certainly, someone who engages in these as-if thoughts need not be making a mistake, but nor is someone who declines altogether such forms of thought.
One thing, however, has certainly not changed from the first edition.
Certainly, there is nothing in the premises (1) and (2) that entails the necessity of (3).
Certainly not the attention it deserves on account of the complications incident to such infections that may arise.
We are certainly not close to the end of the problem, but we are at least at the beginning.
The concept of an ' orthodoxy' is certainly evocative, but little in the way of substance is provided beyond affirmation of the liberalist commitment to openness.
They certainly have, as a common basis, the subjective perspective of either the user or the staff.
In the context of the framework proposed here, it certainly deserves more serious scrutiny as a sound-shaping mechanism that does more than just produce voice.
Certainly, some of the features fit with current feature theories.
Although this is certainly true for gas dynamics, there is surely no reason why it has to be so for any system.
However, union levels and industry membership are certainly important factors in those decisions.
Therefore, there is certainly survivor bias in our sample.
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