本讲为2006年新的教学内容，请对照教材、练习册、语法书听录音！
to do

to play football happily
to listen
do be done
be doing
have done have been done
to do to be done
to be doing
to have done to have been done
___ (not do)

hardly … when…
scarcely … when …
no sooner … than …