I don't know when I can post the letter.改为同义句I don't know ___ ___ ___the letter.请问这是什么句型?为什么这么填?

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Idon''tknowwhenIcanposttheletter.改为同义句Idon''tknow_________theletter.请问这是什么句型?为什么这么填?Idon''tknowwhenIcan

I don't know when I can post the letter.改为同义句I don't know ___ ___ ___the letter.请问这是什么句型?为什么这么填?
I don't know when I can post the letter.改为同义句I don't know ___ ___ ___the letter.
请问这是什么句型?为什么这么填?

I don't know when I can post the letter.改为同义句I don't know ___ ___ ___the letter.请问这是什么句型?为什么这么填?
when to post
这是疑问词+to do sth的省略疑问句形式
I don't know what to do next=I don't know what I will do next

when to post
我不知道什么时候把信寄出。

when to post
这是正解