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Hello,I have an idea of [if need be] in the following sentence。( 1 ) I'll work all night if need be。(rephrased): I'll work all night if there is need in working all night or there is need to work all night or there is need in doing so? ( 2 ) Food is necessary for life. (rephrased): There is need in food for life。I need your confirmation. Thank you for your help.
Comments  
#1 is OK.
#2: Food is necessary for life. (rephrased): There is need in life for food.
Hi MM,Thanks a lot. I have no idea of {There is need in life for food.} (the reason 1) To the original, in necessarity of "life" , food must be needed / food is necessary.
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(the reason 2) I say: There is need in food. = Need exists there which is surrounded or contained in food = Food is necessary / needed.
.(the reason 3) In the original, "for life" means according to / in regard to necessary condition of life, food is necessary.
(the reason 4) In your suggestion, "for food" means the necessity of life has "food" as its purpose. or food needed for the necessarity of life;(the necessity of life means that life is for making the necessity in which food is necessary.)
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Are the four reasons being? Need your help! Thanks.
In your suggestion : There is need in life for food. [life for food]------Life is for making a needing of food / The necessity of life is for making a needing of food.