• Basic forms
• 追う — to chase; pursue / base form
• 追います — (I) chase; pursue / masu form
• 追った — chased; pursued / ta form
• 追って — chase and … / te-form
• 追わない — do not chase / negative form
• 追えば — if (you) chase / conditional
• 追え — chase! / imperative
• Other common forms
• 追いたい — want to chase / 〜たい form
• 追える — can pursue; can chase / potential
• 追えた — was able to chase / past potential
• 追えない — cannot chase / negative potential
• More
• 夢を追う — to pursue a dream
• 犯人を追った — chased the suspect
• 責任を追われている — is being pressed with responsibility / progressive (passive nuance)

追う（おう） is a godan verb ending in う. Used both literally (to chase someone) and figuratively (to pursue goals, tasks, or responsibilities).