what sb.+ do./what is was + done.what 在从句中充当主语/宾语/表语.
where sb.+do where 在从句中充当状语.
who do + sth who 在从句中充当主语
that sb + do + sth.that 在从句中不充当成分,只起引导作用,但在引导主语/表语从句时不可以省略.
what sb.+ do./what is was + done.what 在从句中充当主语/宾语/表语.
where sb.+do where 在从句中充当状语.
who do + sth who 在从句中充当主语
that sb + do + sth.that 在从句中不充当成分,只起引导作用,但在引导主语/表语从句时不可以省略.