In these comparisons, you can see the relationship between the Simple English Propers and the Gregorian chant as it pertains to the propers on the 17th Sunday in Ordinary Time.
The introit is in the major mode V, which provides an effervescent quality to the text: God in His holy place;God who maketh men of one mind to dwell in a house: He shall give power and strength to His people. (Ps. 67: 2) Let God arise and let His enemies be scattered: and let them that hate Him flee from before His face.
The offertory is set in the minor mode II.
The communion is absolutely one of my favorites, and here we are back in a major mode VIII.