Question:
With the right colors, metals and bits of jewels--as well as more secret symbols--we can simulate the planets.

Does it follow that "We will be able to simulate the planets."?
Answer:
yes

Question:
Tommy nodded.

Does it follow that "Tommy didn't nod."?
Answer:
no

Question:
For many years it was the longest bridge in the world, and the huge structure seems to overshadow the town, which sits on the banks of the river below.

Does it follow that "While for many years it was the longest bridge on earth, it was also the tallest."?
Answer:
it is not possible to tell

Question:
The tobacco industry suffered a potentially catastrophic defection.

Does it follow that "A potentially dangerous defection has been suffered by the tobacco industry."?
Answer:
yes