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I just lose (lost my / the) bicycle for ( a) month ago,so I have been bought a new (one) bicycle.It was wonderful,yellow and fast.When I was sad,I usually rode down on the street.I felt comfortable then I already did it (không hiểu ý đoạn này).Once that (One) day,I was riding (to) supermarket to buy bought foods,suddenly I saw (an) accident (on the) over road.That was terrible,So I thought we (should be) were carefully.

Góp ý về ngữ pháp một chút cho bạn nhé. Good luck!

I just lose a bicycle for since one moth ago (or I just lose a bicycle one month ago) ,so I have been bought a new bicycle (a new one).It was wonderful,yellow and fast.When I was sad (when I am sad),I usually rode down on the street (chỗ này bạn để htại thì hay hơn vì có lẽ bây giờ bạn vẫn làm như thế) .I felt comfortable then I already did it (after doing that).Once that day,I was riding to a supermarket to bought buy foods,suddenly I saw an acident over on the road.That was terrible,So I thought we were carefully (we need to be careful).

ride down:(ngoai dong tu)

                    to hit and knock out somebody while riding, especially on horseback

                    to catch up with or overtake somebody

feel+comfortably

Ride down also means going from a high place to a lower place or from the North to the South.

Feel + Adj

oh, thank Cruel Winter ! that remind me.

hi,welcome. Hope we can learn English much more from each other^^