Question:
Visitors need a visa to enter China, and must disembark at the border (now called boundary ) checkpoint, Lo Wai.

Does it follow that "Visitors are required to have a visa if they want to enter China."?
Answer:
yes

Question:
Have you no friends of whom I should disapprove?" John fell back a pace.

Does it follow that "You have friends. "?
Answer:
yes

Question:
Another pistol crack and someone howled in the night.

Does it follow that "Someone was very quiet."?
Answer:
no

Question:
I got mad.

Does it follow that "I was serene."?
Answer:
no