do you know how the traffic accident was happened?这句话对么

How do you know the time?回答 how do you know How do you know? Do you know how to make a sandwich How do you make the sandwich ,do you know?是不是病句 How long is the Changjiang river?Do you know...改为主从复合句.Do you know() How do I know you? how do you know the weather of tomorrow?怎么回答 How much do you know about the Olympic Games? Do you know how Halloween_____(celebrate) in the West? DO you know how to s什么 the maths problem Do you know how to score in the Do you know how to get the ball?的中文? you engine how works know do the?(连词成句) how do you know the admission line of graduate test Do you know how to send the picture?什么意思? How much do you know about the place?与How well do you know the place?的区别 Do you know how I can save the new document?的同义句Do you know------ -----save the new document? how do you know that the teenagers’ dreamshow do you know that the teenagers’ dreams can be quiet different?