句型转换:
（1）I go to school by subway. (对划线部分提问)
                                                               
（2）Can you go to Canada by plane? （作肯定回答）
                                                               
（3）The three colours of the traffic lights are _____ ______ ________.
                                                               
（4）going, am, to, walk, lake, a, near, I （连词成句）