1.His father has been a manager since 2001（改为同义句）His father has
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His father has been a manager since 2001（改为同义句）
His father has(worked as ) a manager( for twelve years ).
2.Mary draws better than all the boys in her class（改为同义句）
(No boys draw ) as (well ) as Mary in her class.
3.No entering!(改为同义句)
You (aren't allowed to go ) into the room!
======以下答案可供参考======
供参考答案1:
1.His father has been a manager since 2001（改为同义句）His father has （worked）（as）a manager（for）（thirteen）（years）.2.Mary draws better than all the boys in her class（改为同义句）（The）（boys）（draw）as （well） as Mary in her class.3.No entering!(改为同义句)You （are）（forbidden）（to）（enter） into the room!