why is have you turned skinny wrong?

[Lippo]

Business English Courses, Elementary Level

ESL/EFL Test #42 "Basic Business English", question 4

Have you .........?

(a) turned skinny
(b) lost weight
(c) no more fat
(d) weighted less

Business English Courses, Elementary Level

ESL/EFL Test #42 "Basic Business English", answer 4

Have you lost weight?

Correct answer: (b) lost weight
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why is have you turned skinny wrong?

Lippo

[Lost_Soul]

Incidentally, why is have you turned skinny wrong?
Isn't it the same as have you become skinny ?

[Mister Micawber]

You cannot 'turn' skinny because 'turn' is too fast a process-- in usual use, of course (just to prebut the person who finds the first exception). Anyway, the very standard phrase is 'Have/Haven't you lost weight?'.
.
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Native English teacher at Mister Micawber's