"certainly observed" is correct and usable in written English.
You might use it when emphasizing the fact that something has been observed—for example, "She certainly observed the other student's attempts to be helpful."
She certainly observed that women tended to cope better in these situations.
Jesus almost certainly observed the law, as did his earliest followers.
You knew the songs they sang, what books they read and you certainly observed them at play with other children to ensure they were being kind and were treated fairly.
Size/dispersal ability tradeoffs have been repeatedly documented in plant fruits [69] [71] and are certainly observed in megafaunal fruits but we found that megafaunal species can pack up to 85% seed load per g of fruit with up to 140 g seed/fruit.
In addition, [M−17]+ is certainly observed in naphthoylindoles.
These results are clearly different from those obtained from DMEM alone or with H2O2, where cells lysis is certainly observed as brilliant green fluorescent spots.
Well, you can certainly observe a lot about where advertising is today by watching a new campaign that features Mr. Berra.
Certainly, observing the far way mountains in Fig. 11 we notice that our airlight also followed that theoretic definition, while [13 15] did not succeed to do so.
While some certainly observe the day, many on the Orthodox end of the spectrum do not.
"What certainly I observed of him when he was on television with me was his ability to analyze an issue and ability to communicate with people".
These three unities of time, place, and action do not occur in Aristotle and are certainly not observed in Classical Greek tragedy.
