who is on duty?什么是主语,什么是谓语,什么是宾语?who能作主语？

who is on duty?什么是主语,什么是谓语,什么是宾语?who能作主语？ who is on duty who is on duty today Who is on duty today?为什么用on duty Who is on duty today ?是什么意思 谢谢 [what who whose]is on duty? who作主语时的动词形式Who ( )on duty today?Who ( )us English this term?a,is b,are c,teach d,teaches who 作主语时的动词形式who ( )on duty today?who( )us English this term?a,is b,are c,teach d,teaches who作主语时的动词形式who( )on duty today?who ( )us English this term?a,is b,are c,teach d,teaches who作主语时,动词用第三人称单数?who ( )on duty today who( )us English this term?a ,is b,are c,teach d,teaches who is ( ) duty today? is on duty today Who is ___ duty today? what is on duty today? 2.Can you tell me ( )else is going to be on duty today?(who,whom) 2.Do you know ______ else is going to be on duty today?（who,whom） Can you tell me ( )else is goning to be on duty tody.( who whom) do you know ___else is going to be on duty today (who/whom)填空 ~~~