Yes, that is exactly what you should tell them. 1  If two clauses are connected with a coordinating conjunction, it's a compound sentence. 2  If two clauses are connected with a subordinating conjunction, it's a complex sentence.
Trains were first- 1784, but cars weren't invented until 1890.
Before starting, all the cars in a freight train are bunched up behind the locomotive. When the engineer opens the throttle, the locomotive starts moving solo until the slack in the first set of couplers runs out, whereupon the first car in the train starts with a jerk.he significance of this will not be apparent until I let you in on a key fact from my vast storehouse of railroad lore: you can't start a whole freight train at once. Too much inertia. Instead you have to start it one car at a time, taking advantage of the slack in the couplers that connect the cars.