Problem: Do "Sir Clifford" and "His" point to the same thing in the following sentence?

Sir Clifford wants me to find him a new groom , about twenty or twenty-one, who knows his business. *His* old coachman is getting feeble, and he wants a man to work with him and get into his ways, who would be able, when the old man was pensioned off, to step into his place.
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A: yes

Problem: Do "Tom" and "he" point to the same thing in the following sentence?

Tom threw his schoolbag down to Ray after *he* reached the bottom of the stairs.
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A: no

Problem: Do "Mark" and "He" point to the same thing in the following sentence?

Mark was close to Mr. Singer 's heels. *He* heard him calling for the captain, promising him, in the jargon everyone talked that night, that not one thing should be damaged on the ship except only the ammunition, but the captain and all his crew had best stay in the cabin until the work was over
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A: yes

Problem: Do "shape" and "it" point to the same thing in the following sentence?

Then he took a piece of iron the shape of the horse horse's foot , and clapped *it* on, and drove some nails through the shoe quite into its hoof, so that the shoe was firmly on
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A:
no