あなたの髪の毛は切る必要がある。

you (referring to someone of equal or lower status); dear (what a wife calls a husband)

indicates possessive; nominalizes verbs and adjectives; substitutes for "ga" in subordinate phrases; (at sentence-end, falling tone) indicates a confident conclusion; (at sentence-end) indicates emotional emphasis; (at sentence-end, rising tone) indicates question

hair (head)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

to cut; to cut through; to perform (surgery); to sever (connections, ties); to turn off (i.e. the light); to terminate (i.e. a conversation); to hang up (the phone); to disconnect; to punch (a ticket); to tear off (a stub); to open (something sealed); to start; to set (a limit); to do (something) in less or within a certain time; to issue (stamps, vouchers, etc.); to reduce; to decrease; to discount; to shake off (water, etc.); to let drip-dry; to let drain; to cross; to traverse; to criticize sharply; to act decisively; to do (something noticeable); to go first; to make (certain facial expressions, in kabuki); to turn (a vehicle); to curl (a ball); to bend; to cut; to shuffle (cards); to dismiss; to sack; to let go; to expulse; to excommunicate; to dig (a groove); to cut (a stencil, on a mimeograph); to trump; (in Go) to isolate (an opponent's stone); to start a fire (with wood-wood friction or by striking a metal against stone); to draw (a shape) in the air (with a sword, etc.); to finish; to complete

necessary; needed; essential; indispensable; necessity; need; requirement

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

to be (usu. of inanimate objects); to exist; to live; to have; to be located; to be equipped with; to happen; to come about