As you've come to realize English doesn't handle the possessive well. We say "a month's leave" but "a table leg" (not a table's leg). I'm not familiar with any rules that'll tell you which one to use.
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VirginiajeanWould it be correct to say, "the boss granted Jane a month leave"?No.
VirginiajeanOrYes.shoulddo I have to use "a month's leave"?
VirginiajeanAspara Gus, may I know the reason why we use the possessive form, which to me, seems no to 'really' imply a full month leave, but rather, a leave 'just' belonging to that month?My guess is as good as yours. I can't add much more to Ivanhr's post.
VirginiajeanAnd also, why is "should have" a wrong compound verb?
Virginiajeanit 'seems' that it means to be of possession to a certain monthThe idea of belonging is not the only idea associated with the use of 's.
Virginiajean... is there any offense in using "a month leave"?It is not correct English, as AG has already told you.
Virginiajeana month leaveNot correct.
Virginiajeanhow we commonly use nouns as modifiers like, 'the father cat'.Noun modifiers are ubiquitous in English. They are as common as mud. There are hundreds and hundreds of them.