• three, thirteen, third, thirty
  thank you
  thigh, thread, thumb
  theater, Thursday

at the beginning of function words

• the
  this, that
  these, those
  they, them
  homophones they´re, their, there
  then, thus, though
   

at the end of a noun or adjective

• bath
  breath
  cloth
  mouth
  teeth
  ...
  birth, death
  north, south
  health, month, truth
  fourth, fifth, sixth, seventh, eighth, nineth, tenth

     at the end of a verb + e

• to bathe
  to breathe
  to clothe
  to mouthe
  to teethe
  to tithe
  ...
  to soothe
  to smooth*
  smooth *adj.

             + y

• healthy
  wealthy
  filthy
   

                  + er

• mother, father, brother
  weather
  another, together
  southern, northern

• Silent TH

asthma
months, depths, widths, lengths  3 consonant sounds at  end of a word

Special Words

cloth voiceless
(to) clothe, clothing voiced
clothes /klowz/ silent th