同义句I don't know when I can start the new lesson=I don't know

同义句I don't know when I can start the new lesson=I don't know I don't know when I can post the letter.改为同义句I don't know __ I don't know when he will have the meeting 同义句 I don't know I don't know how I can use the new machine（同义句） I don't know when I should start（同义句 ）（五分钟答出的, I don't know when I shoud start 同义句转换 I don’t know when we shall start the work. 同义句:I don't know what I can do .转换：I don't know what ( ) ( ) I don't know what clothes I can wear to the party,同义句 I don' i don't know what i can buy in the shop 改为同义句 i don't know （ I don't know how I can get to the airport(改同义句） I.don't know I really don't know when I will start my trip=I really don't