1.You must look after your sister today.(同义句转换)

问题描述:

1.You must look after your sister today.(同义句转换)
You ( )( )look after your sister today.
2.我妈妈每天6点半离开去医院.
My mother ( )( )( )the hospital at ( )past six.

1 ought to 或是 have to
2 leaves home tohalf