Question:
Twins aren't the only clones in everyday life.

Does it follow that "In everyday life there are no clones."?
Answer:
no

Question:
Come on down!

Does it follow that "We would appreciate it if you did not come."?
Answer:
no

Question:
no i used to be i'm in Texas

Does it follow that "I do not live in Texas now, I live in Kansas."?
Answer:
no

Question:
There must be no chance of anyone entering that room." The gravity of his manner impressed them, and Tuppence felt less ashamed of her attack of "nerves."

Does it follow that "Tuppence wasn't as ashamed anymore."?
Answer:
yes