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syukudai wo site kara nemasu.

宿題しゅくだい　を　して　から　寝ねます。syukudai wo site kara nemasu.
I will go to bed after doing my homework.
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Questions & Answers about syukudai wo site kara nemasu.

Why is there no subject in 宿題をしてから寝ます?

Japanese often omits the subject when it’s clear from context. In this sentence, the speaker (I/we) is understood. If you needed to be explicit, you could say:

  • 私は宿題をしてから寝ます。 (As for me, I will go to sleep after doing homework.)
What is the function of を after 宿題? Can I use another particle?

The particle を marks 宿題 as the direct object of the verb する (“to do”). You normally need を when you “do” something.

  • If you replace it with は, you topicalize “homework,” shifting the nuance:
    • 宿題はしてから寝ます。 (Speaking of homework, I will do it and then sleep.)
  • Using が here would be ungrammatical because が marks the subject, not the object of する.
What does してから mean? Why use て-form + から?

The construction V-てから means “after doing V.” It links two actions in sequence:

  1. 宿題をして (“do homework” in the て-form)
  2. から (“after that”)
  3. 寝ます (“go to sleep”)

It emphasizes that the first action must finish before the second begins.

How does V-てから differ from Vたら?
  • V-てから = “after doing A, then B.” It focuses on sequence and completion of A.
  • Vたら = “when/if A happens, then B,” and can express a conditional nuance or a point in time.

Examples:

  • 宿題をしてから寝ます。 (I’ll do homework, and only after that will I sleep.)
  • 宿題をしたら寝ます。 (Once I finish homework, then I’ll sleep—but it also sounds like a simple temporal/conditional statement, not emphasizing order as strongly.)
Can I say 宿題をして寝ます without から? What’s the difference?

Yes, V-て + main verb can show a sequence or just link actions:

  • 宿題をして寝ます。 could mean “I’ll do homework and then sleep,” but it’s a bit more casual and the order can feel less rigid.
  • してから explicitly marks “after doing” and makes the sequence very clear.
Why is the verb 寝ます in the polite form? Can I use the plain form 寝る?

寝ます is the polite (masu) form. In casual speech or writing you can use the plain dictionary form:

  • Casual: 宿題をしてから寝る。
  • Polite: 宿題をしてから寝ます。

Choose based on how formal you want to sound.

Is してから the only way to say “after doing”? Could I use 宿題をした後で寝ます?

You can also say Vた後(で) to mean “after V.” Both express sequence:

  • 宿題をした後で寝ます。
  • 宿題をしてから寝ます。

Nuance:

  • ～てから often feels more conversational and tightly linked.
  • ～た後で can sound a bit more formal or descriptive. Both are correct.