经常出现在单词开头的字母组合有：
bl, cl, fl, gl, pl, sl,
br, cr, dr, fr, gr, pr, tr,
sc, sk, sm, sn, sp, st, sw
qu,
scr, spr, spl, str, squ, shr, thr
ch, sh, th, wh, ph
经常出现在单词结尾的字母组合有：
zz,ff,ll, ss,
mp, nd,
ft, lt, nt, lf, st,
nk, ng
ck, lk
经常出现在单词中间的字母组合有：
bl, cr, mp, nc, nd, nt, rm, rs, rt, st
btr, bst, ctr, trm, ldr, ncl, ncr, nds,ngr, ntr, rnm, rtr,spl, str, tst, zpl
ch, ck, dg, gh,lk, sh, th, ph
cc,dd,ff,gg,ll,mm,nn,pp,ss,tt
希望对你有帮助哦
