• Basic forms
• 試みる — to try, to attempt / base form
• 試みます — polite / I try / masu form
• 試みた — past / tried / attempted / ta form
• 試みて — te-form / try (and…) / linking or request
• 試みない — negative / don’t try / negative form
• 試みれば — if (I) try / conditional
• 試みろ・試みよ — try it! / imperative
• Other common forms
• 試みたい — want to try / 〜たい form
• 試みられる — can try / be attempted / potential / passive
• 試みられた — was tried / was attempted (past)
• 試みられない — can’t try / can’t be attempted
• More
• 試みよう — let’s try / 〜よう form
• 試みなかった — didn’t try / negative past
• 試みている — trying / attempting right now / progressive

試みる (こころみる) is an ichidan (る-verb). Drop る and add endings like ます, た, て, ない. It’s a formal or written way to say “to try” or “to attempt,” often used in essays or news articles.