1.The foreign coins are not worth any money at all.
= The foreign coins are of (no value).
2.What is the price of his new laptop?
= How much did he (spend on)/(pay for)/(spend buying) his new laptop?
3.With trafiic signs and lights,vehicles can travel on crowded streets and highways.
= The traffic signs and lights (enable) the vehicals (to) travel on crowded streets and highways.
注：enable sth to do sth“使得某物能够做某事”,以对应前句中的can.