Difference between turn and turning

[Lyudmila]

Test No. incompl/inter-85 "Simple Present (2)", question 6

If you take the first left after the post office, you come to Sally's place and if you take the second ......... to the right after that you come to the cottage where Andrew lives.

(a) turn
(b) turn up
(c) turn in
(d) turning

Test No. incompl/inter-85 "Simple Present (2)", answer 6

If you take the first left after the post office, you come to Sally's place and if you take the second turning to the right after that you come to the cottage where Andrew lives.

Correct answer: (d) turning
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Why "turning" not "turn"?
Tnx.

[Alan]

Turn is either verb or noun. As a noun it really means twist in the sort of instruction about a handle: You then make two turns to the right and then one to the left. Turning is the word for a much larger movement where you leave the main road and go to the left or right.
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