Present Tense: study / studies

He studies English every day.  

Present Continuous Tense: (be) studying

He's studying English online right now.

  Fazal is studying English online.

Past Tense: studied

• What did he do last night?
• He studied his English.  

Infinitive: He wants to study English because it will help him get a better job.

Gerund: Studying English is difficult, but if you work hard, you will learn it.