BEI

bei(1)

杯 (usually 杯子) = cup

bei(2)

北 = north

bei(3)

bei(4)

备 = get ready

请准备 = qing(3) zhun(3) bei(4) = (the 'u' in the third tone is spoken as u-e = Please get ready

贝 = shell used as money in the past; not used often as a independent character, but part of many characters that have to do with values

被 (also usually 被子) = quilt

被 = used for passive voice

Sample sentence from dictionary:

他被迭为代表.

He was elected a representative.

Owned confirmed sample sentence:

你不必须 = Ni(3) bu(2) bi(2)xu(1)