I have some questions on the preposition “by”.
(1) I want the waist taken in two inches.
(2) Shorten the sleeves by two inches.
Shorten has the same meaning as take in. Then, why isn’t “by” used in (1)? I mean, shouldn’t it be “I want the wast taken in by two inches.”? So, my questions are:
a) Why is “by” used in (2) while it is not used in (1)?
b) If I put “by” before “two” in (1), would it be wrong?
c) When is the “by” used?
Thank you for your answers in advance,