sentei ga owatta.

It is read:

• 剪定 = せんてい
• が = が
• 終わった = おわった

So the full sentence is:

• せんてい が おわった。

剪定 means pruning, especially of trees, shrubs, or garden plants.

It is a somewhat formal or technical word compared with everyday words like 切る or 刈る. You will often see it in gardening, landscaping, or agriculture contexts.

Because 終わる is an intransitive verb, meaning to end or to be finished.

In this sentence, 剪定 is the thing that ended, so it takes が:

• 剪定が終わった = The pruning ended / The pruning is finished

A useful contrast is:

• 剪定が終わった = the pruning ended
• 剪定を終えた = someone finished the pruning

So が marks the thing that is in the state of being over.

This is a very common learner question.

• 終わる = to end, to be over
  
  • intransitive
• 終える = to finish something
  
  • transitive

So:

• 剪定が終わった focuses on the event itself being over
• 剪定を終えた focuses more on a person completing it

In English, both may translate naturally as The pruning finished or I finished the pruning, depending on context, but the Japanese grammar is different.

Not directly.

Grammatically, it means something like:

• The pruning ended
• The pruning is finished
• The pruning has finished

Japanese often leaves out the person involved if it is obvious from context, so in real conversation this could be used in a situation where the speaker means that the pruning work they were doing is now done. But the sentence itself does not explicitly say who did it.

Because Japanese past forms often express a completed action or resulting state.

So 終わった can mean:

• ended
• has ended
• is over
• is finished

This is very normal in Japanese. The past form does not always line up exactly with English past tense.

It is primarily a noun, but it is also a verbal noun that can be used with する.

For example:

• 剪定 = pruning
• 剪定する = to prune

In 剪定が終わった, it is being used as a noun: the pruning.

This is about が vs は.

• 剪定が終わった

  • neutral statement
  • focuses on the fact that the pruning has finished
  • often presents new information

• 剪定は終わった

  • as for the pruning, it’s finished
  • can sound contrastive
  • may imply something else is not finished

For example, 剪定は終わったけど、片付けがまだだ means The pruning is finished, but the cleanup isn’t yet.

Because the verb here is 終わる, not 終える.

With 終わる, the thing that ends is marked with が:

• 会議が終わった = The meeting ended
• 授業が終わった = Class ended
• 剪定が終わった = The pruning ended

If you use a transitive verb instead, then you can use を:

• 剪定を終えた = finished the pruning

Yes, it is natural, especially in context.

It sounds like a short report or update, such as:

• after doing garden work
• after asking whether the work is done
• in a work or household context

By itself, it may sound a little clipped, but short sentences like this are very common in Japanese when the context is already clear.

The polite version is:

• 剪定が終わりました。

That is the same basic sentence, but with polite verb form.

You might use it when speaking to:

• a customer
• a superior
• someone you do not know well
• in a formal work setting

No. In normal Japanese writing, you would usually write it without spaces:

• 剪定が終わった。

Spaces are often added in teaching materials to make the sentence structure easier for learners to see.