French language Q&A Forum

Been looking at this for a long time. Conclusion is if you want to write a sentence using a/the/my , Or making a general opinion then use c'est. Otherwise use I'll/Elle est to make a specific opinion towards something/someone if there is no a/the/my in the sentence? 

"Ils avaient fait..." 

"Il avait fait..." 

These two sentences sound same. Is there a way that we can understand the correct sujet?

for example...