Tenses of verb for the word develop:
Past: developed
Present: develop/developing
Since its a sibling, and siblings tend to be in a person's close circle of people, informal speech is used.
Since before recorded history, environmental changes have affected things people value. In consequence, people have migrated or changed their ways of living as polar ice advanced and retreated, endured crop failures or altered their crops when temperature and rainfall patterns changed, and made numerous other adjustments in individual and collective behavior. Until very recently, people have responded to global phenomena as if they were local, have not organized their responses as government policies, and have not been able to respond by deliberately altering the course of the global changes themselves. Things are different now from what they have been for millennia.
A. Algernon had the operation to make him smarter
hope it helps:)
