I don't know when I can post this letter .

I don't know when I can post this letter . I don't know when I can post the letter.改为同义句I don't know __ I don't know where I can post this letter .=I don't know _ _ i don't know how i can get to the nearest post office.(原意) i 同义句：I don't know how I can get to the post office. when it left scars can heal~i don't know~ I don't knokwhere I can buy this kind of boots.=I don't know I don't know _____I can deal with this matter. 同义句I don't know when I can start the new lesson=I don't know i don't know how much longer i can keep this up.其中i can keep You can't post this letter without i don't know can i finish it when i go to school 语法对吗