My sister isn't old enough to go to school.同义句

My sister isn't old enough to go to school.同义句
1.My sister is ---- ----- ----- go to school.
2.Shall we go for a picnic tomorrow?同上
---- ----- go for a picnic tomorrow?
3.他太激动了,一句话也说不出来.【英语】
安娜太小了,还不能上学.
树上的一片树叶足以使她非常高兴.