what is the difference between the terms ocean and sea. how to use thee terms

about this site Hi ever body, i want to refine my english from some years. i used formal methods i.e., study grammer, reading news papers etc. but i could develop as i expected.finally i thought that if i could talk to a native speaker , i can improve better, so i have been searching for language exchange sites since some days. i finally could find this site. i offer my readiness to teach my mother tongue, asked help for developing my english. i could get a response from a native english speaker , i felt very happy. thanks to this site for giving me this wonderful opportunity. Thank You.......

First notebook entry: Introducing myself Hello, my name is trimurthulu, I am an Indian.i have been working as a mathematics teacher in a school.i want to improve my english. Ican understand english but cant speak fluently. so that i want to improve my spoken form. i enjoy in reading book, browsing internet,listening musics are my main hobbies. thank you..