By no means      true that all native speakers of English know their own language very well．

—— I usually go there by train. —— Why not＿＿＿＿＿by boat for a change?  

________, I believe, and you will find that he is very outgoing.

___he met with the difficulty did he realize the importance of our help.

 ---Did you see who the driver was?----No, so quickly ______ that I didn’t make out what his face was like。