培训音变篇
They have all gone. /hv/-/hf/   It looks as white as snow./z/-/z/ Give him what he wants. /him/-/im/         
  Which words are pronounced strongly/weakly?
prep.  to at
art. an the
conj. and but
Function word
auxiliary verb
modal verb
verb. go
adv. away
  noun. idea
adj. clean
  num. two
Notional word
Weak  form
Strong form