she's had her lunch,（ （改反义疑问句）

she's had her lunch,（ （改反义疑问句）
you'd better go to see your sister,( （改反义疑问句）
Let's go to school,(
（改反义疑问句）
he hurt his foot yesterday,(
（改反义疑问句）
把以下句子翻译:
那个箱子太重了,我搬不动.
the box is ( ) heavy ( ) ( ) to carry.
我弟弟到了上学的年龄.
my brother is old ( ) ( ) go to school.