• Basic forms
• 通る — to pass; go through / base form
• 通ります — (it) passes; goes through / masu form
• 通った — passed; went through / ta form
• 通って — passing through; please go through / te-form
• 通らない — does not pass; doesn’t go through / negative form
• 通れば — if it passes; if (something) goes through / conditional
• 通れ・通りなさい — go through!; please pass / imperative
• Other common forms
• 通りたい — want to pass; want to go through / 〜たい form
• 通れる — can pass; be able to go through / potential
• 通れた — was able to pass / past potential
• 通れない — cannot pass; cannot go through / negative potential
• More
• 通ろう — let’s pass; let’s go through / 〜よう form
• 通らなかった — didn’t pass; didn’t go through / past negative
• 通っている — is passing; is going through / progressive

通る（とおる） is a godan (5-dan) verb. The stem changes as you add endings: る → り → っ, as in 通る・通ります・通った.

• Basic forms
• 通う — to commute; go regularly / base form
• 通います — (I) commute; go (there) regularly / masu form
• 通った — commuted; went back and forth / ta form
• 通って — commuting; go back and forth / te-form
• 通わない — do not commute; don’t go / negative form
• 通えば — if (you) commute; if (someone) goes / conditional
• 通え・通いなさい — commute!; please keep going / imperative
• Other common forms
• 通いたい — want to commute; want to go / 〜たい form
• 通える — can commute; be able to go / potential
• 通えた — was able to commute / past potential
• 通えない — cannot commute; can’t go / negative potential
• More
• 通おう — let’s commute; let’s keep going / 〜よう form
• 通わなかった — didn’t commute; didn’t go / past negative
• 通っている — is commuting; goes there regularly / progressive

通う（かよう） is also a godan (5-dan) verb. The stem shifts わ → い → っ in forms like 通う・通います・通って.