"before demonstrating" is a grammatically correct and commonly used phrase in written English.
It can be used as a introductory phrase to describe something that happens before a demonstration or to indicate the sequence of events in a sentence. Example: Before demonstrating the experiment, the scientist explained the methodology and expected results to the audience.
Carmack made some minor modifications before demonstrating the prototype at that year's E3 games convention in LA.
The EDL were escorted back to the station and kettled for ages, the police seemingly aping the tactics they used against students and G20 protesters to make them mind-numbingly bored and miserable so that they think twice before demonstrating again.
We obtained essential identical values as before, demonstrating that the accelerated growth rate of these cells is due to the CYS4(1 353) allele (Fig. 4).
Testing of RIα and RIIβ regulated genes against this core group of genes (SERUM_FIBROBLAST_CORE_UP or DN) gave similar results as before, demonstrating that the changes in gene expression induced by these two PKA subunits went well beyond just simple alterations of cell cycle.
Before demonstrating how the machine works, Tracy makes a speech to a group of corporate executives.
"I wanted it warm, cozy, informal," she said, before demonstrating how the living room converts into a screening room.
While those of us running the course are proud that it is the first of its kind, the fact that it has never been done before demonstrates the crisis at the heart of British academia.
Chelsea gave City some anxious moments late on but what had gone before demonstrated why there were 25 points separating these teams in the Premier League last season.
I came to Paris full of hope, confident that I would be present in the city for a monumental moment, that I would be able to witness international cooperation and diplomacy on a scale never before demonstrated.
As before, LSD demonstrated its unpredictable nature.
