The spaces are usually just for learners.
In normal Japanese writing, this would usually be written as:
この生徒は優秀です。
Japanese does not normally use spaces between words the way English does. Textbooks and beginner materials often add spaces to make the structure easier to see.
この means this, and it must be followed by a noun.
So:
A useful comparison:
Also, この cannot stand by itself. You can say:
But not just この to mean this one. For this one, Japanese uses これ.
生徒 means student, but it often refers to a student in a school setting such as elementary school, middle school, or high school.
It is not always exactly the same as 学生:
So この生徒は優秀です sounds like This student/pupil is excellent, often in a teacher-or-school context.
は marks the topic of the sentence.
So:
Then the rest of the sentence says something about that topic:
A natural way to understand the structure is:
In English, we usually just say This student is excellent, but Japanese often organizes sentences as topic + comment.
This is a special case for the particle は.
When は is used as a topic particle, it is pronounced wa:
But when は is part of a regular word, it is usually pronounced ha.
This is just one of those important spelling-and-pronunciation conventions you memorize early in Japanese.
優秀 is what is often called a na-adjective in beginner textbooks, though grammatically it behaves more like a noun-like descriptive word.
It means something like:
Unlike an i-adjective, it does not end in -い. That is why it does not become 優秀い or anything like that.
Before a noun, it uses な:
At the end of a polite sentence, it can be followed by です:
Because 優秀 is not an i-adjective.
With an i-adjective, you can say:
But with a na-adjective like 優秀, you say:
In polite speech, です gives the sentence a polite ending. In plain style, you could say:
The second one is more casual and context-dependent.
Japanese sentence structure works differently from English.
English needs a linking verb:
Japanese does not place a separate word in the middle in the same way. Instead, the sentence ends with です here:
So Japanese often puts the main predicate at the end of the sentence. That is very normal.
The structure is:
この生徒 + は + 優秀です
or:
this student + topic marker + is excellent
Japanese often follows a topic/comment pattern, and the predicate comes at the end.
So rather than thinking only in terms of English word order, it helps to see it as:
Yes, but it changes the nuance.
Very roughly:
If you are just making a general statement about the student, は is the most natural choice.
Yes. It is in polite style because it ends with です.
Polite:
Plain:
So the original sentence is appropriate in normal polite conversation, classroom discussion, or formal everyday situations.
You would put な after 優秀 because it modifies a noun:
This is a very important pattern for na-adjectives:
So:
The second version is grammatical, but it sounds more repetitive than necessary.
Not exactly.
優秀 is stronger and more specific than just good. It suggests someone is excellent, outstanding, or high-performing.
For example, it often implies ability, performance, or quality in a noticeable way.
So this sentence sounds more like:
rather than just:
That makes 優秀 a useful word in academic, professional, or evaluative contexts.