You seem to be making lots of mistakes. The subject line should read: Talking about the advantages and disadvantages of buses, trains, and airplanes The sentences should read: Bus moves slowly but it's easy to go by and its ticket costs less. Train has an expensive ticket.
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QuangtrungvtvI think :You're right.
Plane= Airplane
Low cost = cost less?
QuangtrungvtvDisadvantage of travelling by buses is that it takes too long but readily available and the advantage is, it cost less.
Bus is slow rate but it's eassy to go by and low cost ticket.
Train is expensive cost ticket.
BubblebathI've read that "a/an" is used for a general satement in a textbook. For example, an apple is red.A bus is usually slower than car - this is a general statement.
So can you say "a bus is slow" as a general statement?