举例 ￥1gram Bigram Unigram they, do, approach 1 they do,have d。, anything2 d。384 they do link do, approach 1 they do,not do no they, do,on they do, open they, do,so 2173115 do, not do novell 1711 do, offer they do,under they, do 22 PMLE(not they, do)=7/22=0.318 C(they, do, not)=7 PMenot do 97/384=0.253 C(do, not) =97 MELo offer they, do)=0/22=0 PMLEChave they, do)=2/22=0.091Trigram they,do,approach 1 they,do,have 2 they,do,Link 1 they,do,not 7 they,do,on 3 they,do,open 1 they,do,so 1 they,do,under 5 Bigram do,anything 2 do,approach 1 do,no 1 do,not 97 do,Novell 1 do,offer 1 ... they,do 22 Unigram do 384 ... C(they,do,not) C(do,not) = 7 = 97 PMLE(not|they,do) PMLE(not|do) = 7/22 = 0.318 = 97/384 = 0.253 PMLE(offer|they,do) = 0/22 = 0 PMLE(have|they,do) = 2/22 = 0.091 举例