Bǐrú " hé " zì jiù shǔyú xíngshēng: zuǒbian de sāndiǎnshuǐ biǎoshì yìsi, yòubian de " kě " biǎoshì dúyīn.
Take the character for "river": the water radical on the left gives the meaning, and the part on the right, kě, gives the sound.
Tips
usage
The method is 形声; a character built this way is a 形声字, and well over 80 percent of characters are. 形 is the meaning part, the 形旁, and 声 the sound part, the 声旁.