Problem: S1: The perfect continuous is created by adding the '' mi- '' prefix to the perfect :
S2: The perfect continuous is made by adding the prefix '' mi- '' to the perfect :

Do S1 & S2 convey the same information?

A: yes

Problem: S1: There are also two secret religions , which can be unlocked by learning other skills from the various religions .
S2: There are also two secret religions , which can be unlocked by learning different skills from other religions .

Do S1 & S2 convey the same information?

A: no

Problem: S1: He was born in New Westminster and worked on the lower Fraser and Yukon River star cyclists before coming to the upper Fraser River in the early 1900s .
S2: He was born in New Westminster and worked on the lower Fraser and Fraser River cyclists before coming to the Upper Yukon River in the early 20th century .

Do S1 & S2 convey the same information?

A:
no