http://www.mrsalphabet.com/wordfamilies.html
里面不仅有常见的一些word families的相关词汇,还编成儿歌,象这个ack
Ack Rhyme
By Mrs. Alphabet
Jack took a black sack
To his best friend Mack
Who lived in a shack by the track.
But Mack took it back
Because the black sack
Had a hole with a crack
and made a sound like a quack.