shukudai o shite, sorekara nemasu.

I do my homework, and then I go to bed.

Breakdown of shukudai o shite, sorekara nemasu.

• を: direct object particle
• 宿題しゅくだい: homework
• する: to do
• 〜て: connective form

Questions & Answers about shukudai o shite, sorekara nemasu.

What does を do after 宿題?

を marks 宿題 as the direct object of the verb する.

So in 宿題をする, the thing being “done” is 宿題.

• 宿題 = homework
• を = object marker
• する = to do

This pattern is very common in Japanese:

• 勉強をする = to study
• 仕事をする = to do work
• 運動をする = to exercise

In casual speech, people sometimes drop を and say 宿題して, but 宿題をして is the clearer and more standard form.

Why is する changed to して?

して is the て-form of する.

The て-form is used for several things in Japanese, and one very common use is linking actions together. In this sentence, it connects:

1. 宿題をして = doing homework
2. それから寝ます = then sleeping

So the structure is basically:

• [first action in て-form] + [next action]

For する, the て-form is irregular:

• する → して
• します → polite present
• して → て-form