• Basic forms
• 続ける — to continue (something) / base form
• 続けます — polite / I continue / masu form
• 続けた — past / continued / ta form
• 続けて — te-form / continue (and…) / linking or request
• 続けない — negative / don’t continue / negative form
• 続ければ — if (I) continue / conditional
• 続けろ・続けよ — continue! / imperative
• Other common forms
• 続けたい — want to continue / 〜たい form
• 続けられる — can continue / be continued / potential / passive
• 続けられた — was continued / could continue (past)
• 続けられない — can’t continue / cannot be continued
• More
• 続けよう — let’s continue / 〜よう form
• 続けなかった — didn’t continue / negative past
• 続けている — continuing / have continued / progressive

続ける (つづける) is an ichidan (る-verb) and **transitive**, meaning it takes a direct object. Drop る and add endings like ます, た, て, ない. Common uses include 勉強を続ける (to continue studying) and 仕事を続ける (to keep working). The intransitive counterpart is 続く (つづく) — something continues by itself.