同义句转换1.I don`t think my brother can work out this problem al

同义句转换
1.I don`t think my brother can work out this problem alone (改为同义句）
.I don`t think my brother can work out this problem __ ___
2.Will you go to the park by car tomorrow moring （改为同义词
Will you ---- ------- the park tomorrow morning
3.my mother is ill.I must look after her at home （改为同义句)
my mother is ill ,I ---- ----- look after her at home.