i don't know how big/large he is

i don't know how big/large he is how big he is还是how large How old is he? I don't know （变为同义句）I don't know ____ ____ don't where he I know is 句型转换 He is on the school basketball team.I don't know how i 修改句子.（1）I don't know how big is Beijing.(2)Beijing is got lo I don't know how old he is 同义句转换 I don't know how is was that he narrowly escaped being kille I don't know how old he is.(改为同义句） I have__ __how old he is. I don‘t know how soon he will come back i don't know what is he doing? I don't know where he is意思