I am a new member on this site. So please guide me somewhere else if I post anything incorrect.
I have been working on these two sentence corrections that ask about Present Perfect, Past Perfect and the Simple Past. They have been a little confusing.
During the 1950s, the Detroit area emerges as a metropolitan region with the construction of an extensive freeway system that had expanded in ensuing decades.
For the one above, I said had expanded should be changed to has expanded since this is continuing to happen (ensuing decades).
However the answer is supposed to be expanded.
In a discovery at least fifty yeas in the making, a new and bizarre dinosaur species has been identified in a slab of rock collected by scientists working in South Africa in the 1960s.
The answer I put for this one is was since this happened in the past.
However the book says that it is fine as it is.
Although the ancient Egyptians abandoned Demotic more than 1,500 years ago, taking up Coptic and eventually Arabic, the language lived on in words like "adobe," which entered Spanish before passing into English.
For the one above I said has lived should be the accurate answer since the language is still living on in English...
However the answer is to leave it as it is.
I would appreciate if you guys could provide a different perspective into this.