すぐに勉強する

You simply place suguni before the verb benkyō suru. It works as an adverbial phrase to add urgency. You can use the dictionary form benkyō suru with friends. Use the polite form benkyō shimasu with teachers or parents. It is a very versatile and common collocation. You will hear it in schools and homes daily.

Use it when your mom asks about your homework. Use it when a friend invites you out before a test. It is perfect for those 'oh no' moments before exams. You can text it to a study group to show motivation. It works well when you feel a sudden burst of energy. Use it to reassure someone you are being productive.

Don't use it if you actually plan to wait. If you say suguni but then watch TV, you'll lose trust. Avoid it in very formal business meetings about non-study tasks. It is specifically for learning and academic contexts. Don't use it if the task is just a quick check. It implies a dedicated session of focused learning.

Japan has a very strong culture of 'ganbaru' or doing one's best. Diligence is highly respected from a young age. Students often attend 'juku' or cram schools until late at night. Saying you will study 'immediately' shows you respect your responsibilities. It reflects the social value placed on academic effort and discipline. Being prompt is seen as a sign of maturity.

For a more casual vibe, just say sugu benkyō suru. The ni makes it feel slightly more deliberate. If you want to sound very polite, use suguni benkyō itashimasu. To tell someone else to do it, say suguni benkyō shinasai. You can also add yo at the end for emphasis. suguni benkyō suru yo! sounds like a friendly promise.