To_start_with,_a_vast_population_leads_to_heavy_traffic.

　　2．最后一个原因是一些人没有意识到遵守交通规则的重要性。(that引导表语从句)

　　The_last_but_not_least_reason_is_that_some_people_don't_realize_the_importance_of_respecting_traffic_rules.

　　3．为了解决这个问题，一些学生建议建设更多宽阔的道路。(不定式作目的状语；suggest)

　　To_deal_with_this_problem,_some_students_suggest_that_we_(should)_build_more_wide_roads.

　　4．有人认为我们应该多步行或多骑自行车。(宾语从句)

　　Someone_else_thinks_we_should_walk_and_ride_the_bike_more.

　　5．减少私家车的使用。(private cars)

　　We_should_drive_private_cars_less.

　　6．行人应该遵守交通规则。(obey)

　　Pedestrians_should_obey_traffic_rules.

　　7．行人在红灯时不要乱穿马路。(at a red light)

　　Pedestrians_shouldn't_cross_the_road_at_a_red_light.

　　第四步：句式升级造亮点

　　1．用instead of合并句4和句5

　　Someone_else_thinks_we_should_walk_or_ride_the_bike_more_instead_of_driving_private_cars.

　　2．用and并列句合并句6和句7

　　Pedestrians_should_obey_traffic_rules_and_not_cross_the_road_at_a_red_light.

　　第五步：过渡衔接联成篇

　　How to solve the problem of heavy traffic

　　Almost every city has a big traffic problem. Today, our class have a debate about how to solve it.

　　There_are_many_reasons_for_traffic_jams._To_start_with,_a_vast_population_leads_to_heavy_traffic._The_second_reason_is_the_increasing_number_of_vehicles,_especially_private_cars._The_last_but_not_least_reason_is_that_some_people_don't_realize_the_importance_of_respecting_traffic_rules.

　　To_deal_with_this_problem,_some_students_suggest_that_we_(should)_build_more_wide_roads._Others_insist_on_offering_many_more_bus_routines_to_improve_transport._Someone_else_thinks_we_should_walk_or_ride_the_bike_more_instead_of_driving_cars.And_pedestrians_should_obey_traffic_rules_and_not_cross_the_road_at_a_red_light.