一般规则是字母i在e前面，但在c之后除外：

believe sieve

但是：

deceive receipt

下面这些词例外，都拼写为ei：

beige feint heir reign their

counterfeit foreign inveigh rein veil

deign forfeit inveigle seize vein

eiderdown freight leisure skein weigh

eight heifer neigh sleigh weight

either height neighbour sleight weir

feign heinous neither surfeit weird