求英语句型转换答案My aunt didn't give me a bike on my birthday.(改

求英语句型转换答案
My aunt didn't give me a bike on my birthday.(改为被动语态）
The room is quite large.It can hold so many people.(用不定式改写句子）
I really don't know what I shold write to him.(改为同义句）
I really don't know —— —— ——to him.
We will go home after we get it back. .(改为同义句）
We ___ go home ___ we get it back.
My little sister is so young that she can't dress herseif yet..(改为同义句）
My little sister is___ young___dress herseif yet.