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(1) th位于詞首時(shí)，可以從詞性上判別其應有的讀音。在名詞、動(dòng)詞、形容詞和數詞中th發(fā)清輔音。如：thing, theatre, thunder, thermos, Thursday, theory, theme, throat, thread, think, thank, thrive, thicken, thirteen, thirty, third, thousand, thick, thirsty, thoughtful, thorough 在代詞和一些功能詞中th發(fā)濁輔音.如： them, their, theirs, there, the, than, then, though, thus, therefore, they。只有介詞through是個(gè)例外。 
(2) th位于詞尾（或音節之尾）時(shí)，其讀音多數是清輔音，如：bath, breath, tooth, 等。只有在少數單詞中，如：with, smooth 中讀濁音。 
(3) th在詞中并且后面接er時(shí)，或者最后一個(gè)字母是不發(fā)音的e時(shí)，通常也發(fā)濁輔音。例如：feather, weather, whether, leather, further, father, bathe, breathe, southern, northern, either等。在其他情況下發(fā)清輔音。例如：author, faithful, method, nothing, anything, healthy, wealthy。 
試讀下列單詞: mother, father, another, brother, health, wealth