1. th (voiced)

a. them /ðɛm/

 
them
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b. mother /'mʌð ɚ/

 
mother
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c. smooth /smuð/

 
smooth
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2. th (unvoiced)

a. think /θɪŋk/

 
think
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b. method /'mɛθ əd/

 
method
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c. bath /bæθ/

 
bath
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More 'voiced and unvoiced th' material