When do you use for in grammar?

Answer 1

For is a preposition and should be used in prepositional phrases. Below are meanings of the word for- for |fôr; fər|preposition1 in support of or in favor of (a person or policy) :they voted for independence in a referendum.2 affecting, with regard to, or in respect of (someone or something) : she is responsible for the efficient running of their department | the demand for money.3 on behalf of or to the benefit of (someone or something) : these parents aren't speaking for everyone.• employed by : it was a good firm to work for.4 having (the thing mentioned) as a purpose or function : she is searching for enlightenment | the necessary tools for making a picture frame.5 having (the thing mentioned) as a reason or cause :Aileen is proud of her family for their support | I could dance and sing for joy.6 having (the place mentioned) as a destination : they are leaving for Swampscott tomorrow.7 representing (the thing mentioned) : the "F" is for Fascinating.8 in place of or in exchange for (something) : swap these two bottles for that one.• charged as (a price) : copies are available for only a buck.9 in relation to the expected norm of (something) :she was tall for her age | warm weather for this time of year.10 indicating the length of (a period of time) : he was in prison for 12 years | I haven't seen him for some time.11 indicating the extent of (a distance) : he crawled for 300 yards.12 indicating an occasion in a series : the camcorder failed for the third time.conjunction poetic/literarybecause; since : he felt guilty, for he knew that he bore a share of responsibility for Fanny's death.PHRASESbe for it Brit., informal be in imminent danger of punishment or other trouble.for all -- see all .for ever see forever .for why informal for what reason : you're going to and I'll tell you for why.oh for -- I long for -- : oh for a strong black coffee!there's (or that's) -- for you used ironically to indicate a particularly poor example of (a quality mentioned) : there's gratitude for you.ORIGIN Old English , probably a reduction of aGermanic preposition meaning [before] (in place or time); related to German für, also to fore .for-prefix1 denoting prohibition : forbid.2 denoting abstention, neglect, or renunciation: :forgive | forget | forgo.3 denoting extremity of negative state expressed :forlorn | forsake.ORIGIN Old English .

Answer 2

"For" can be used in grammar to indicate purpose, time duration, or as a conjunction to introduce reasons or explanations. It can also be used to express the idea of "in favor of" something or to denote an exchange or equivalence.