• Basic forms
• 仕える — to serve; to work for / base form
• 仕えます — (I) serve / masu form
• 仕えた — served / ta form
• 仕えて — serve and …; please serve / te-form
• 仕えない — do not serve / negative form
• 仕えれば — if (you) serve / conditional
• 仕えろ・仕えなさい — serve! / imperative
• Other common forms
• 仕えたい — want to serve / 〜たい form
• 仕えられる — can serve / potential
• 仕えられた — was able to serve / past potential
• 仕えられない — cannot serve / negative potential
• More
• 仕えよう — let’s serve / 〜よう form
• 仕えなかった — didn’t serve / past negative
• 仕えている — is serving / progressive

仕える（つかえる） is an Ichidan verb. It conjugates by dropping the る and adding endings like ます, て, or た. It typically means to serve a master, a deity, or a superior.