transportation 3,4,5,6

Amazing Cherry, thank you for this. :)

3. I usually use the bus because there are so many buses in my area and it is comfortable.

>> Correct.

 I have tried riding the subway in Seoul that is not exist in my area, but it was really convenient than the bus.

>>  I have tried riding the subway in Seoul, it really more convenient than the bus. We don\'t have it in our area though.

So I think the subway is faster and the most comfortable when I move to where.

>> That is why I think that the subway is much more comfortable and convenient.

 4. I think the subway and train are the common means of transport in my country.

>> Correct.

 This is because subway is the most convenient when moving in one city and train is the most convenient when moving to other city.

>> I still think that the train and subway are the most convenient transportation when  moving to another city.

 I always use the train, ktx, when I go to the Seoul. 

>>  I always use the train or the KTX, when I go to Seoul. 

 5. My city is not a big city like Seoul, it is just small city so there are no often traffic jams.

>>  5. My city is not a big city like Seoul. It is just small city so there are no traffic jams often. 

However, when rush hour, because of traffic jam we can move very slowly.

>> However, during the rush hour, because of the traffic jam, we can move very slowly.

Specially if there was an accident we can\'t move as well.

>> Especially if there is an accident we can\'t move as well.

 6. Time problem is the biggest change in transportation.

>> Duration of the trip may be the biggest problem in transportations.

Because from Ulsan to Seoul it takes about 5 hours by bus or car.

>>It is because , from Ulsan to Seoul, it takes about 5 hours by bus or car.

However, after train like ktx is developed we can go about 2 hours and half.

>>However, after the train like the KTX was developed, we can travel for about 2 and a half hours.