Friend there is a problem in present perfect tense, past indefinite, future perfect tense and future perfect continuous tense.
In present perfect it should be "Main chalta raha hoon " मैं चलता रहा हूँ . wrong (It should not be Main chal raha tha. - tha can only be used in past tense)
In past indefinite it should be "Main chala" मैं चला
In future Perfect Tens it should be मैं चल chuka हूगां. Main chal chuka hoonga.
Future Perfect Continuous में चल रहा हूगां (hou¥gaa).