sensei ha watasi ni atarasii zisyo wo kudasaimasita.

は marks 先生 as the topic of the sentence.

So 先生は means as for the teacher or the teacher, ....

In this sentence, the teacher is the person the sentence is mainly about. Japanese often organizes information by topic first, rather than by subject in the same way English does.

• 先生は = as for the teacher
• 私に = to me
• 新しい辞書を = a new dictionary
• くださいました = gave (to me/us), respectfully

So the structure is something like:

As for the teacher, to me, a new dictionary gave.

That sounds strange in English, but it is normal in Japanese.

に marks the recipient here—the person who received something.

So:

• 私に = to me

In giving/receiving sentences, に often shows who receives the item.

Examples:

• 先生は私に本をくれました。 = The teacher gave me a book.
• 友だちは弟にお菓子をあげました。 = My friend gave sweets to my younger brother.

In your sentence, 私 is the receiver, so に is used.

を marks the direct object—the thing being given.

So:

• 新しい辞書を = a new dictionary (as the object)

The dictionary is the thing that moves from the giver to the receiver.

Compare:

• 先生は私に新しい辞書をくださいました。
  • The teacher gave me a new dictionary.

Here:

• giver = 先生
• receiver = 私
• thing given = 新しい辞書

くださいました is the honorific / respectful version of くれました.

Both can mean gave me or gave to me/us, but くださいました shows respect toward the giver.

So:

• くれました = gave me
• くださいました = gave me (respectful)

Since 先生 is a teacher, using a respectful form is very natural.

Compare:

• 友だちが本をくれました。 = My friend gave me a book.
• 先生が本をくださいました。 = My teacher gave me a book.
  (more respectful)

Because あげる is used from the perspective of the giver, and it is generally not the right choice when talking about someone of higher status giving something to you.

Japanese has different giving verbs depending on perspective:

• あげる = give (from the giver’s side / outward)
• くれる = give (to me or someone close to me)
• くださる = respectful version of くれる

Since the teacher gave something to me, and the teacher deserves respect, くださいました is the natural choice.

Using あげました here would sound wrong or at least very unnatural in normal Japanese.

Because Japanese is usually a verb-final language.

A basic Japanese sentence often ends with the main verb:

• topic / subject
• time / place / recipient / object
• verb

So in this sentence:

• 先生は
• 私に
• 新しい辞書を
• くださいました

The verb comes last, which is completely normal in Japanese.

Because adjectives usually come before the noun they describe in Japanese, just like in English.

• 新しい辞書 = new dictionary

Here, 新しい is an i-adjective, and it directly modifies 辞書.

Examples:

• 大きい犬 = big dog
• 面白い本 = interesting book
• 新しい辞書 = new dictionary

So this part is actually very straightforward for English speakers.

新しい is an i-adjective.

Japanese adjectives are often divided into two major types:

• i-adjectives: end in い
• na-adjectives: usually need な before a noun

So:

• 新しい辞書 = new dictionary
  (新しい is an i-adjective)

Compare:

• 静かな部屋 = quiet room
  (静か is a na-adjective, so it becomes 静かな before the noun)

It can often be omitted if the receiver is clear from context.

Japanese frequently leaves out information that both speakers already understand.

So depending on context, you might hear:

• 先生は新しい辞書をくださいました。

This can still mean The teacher gave me a new dictionary, if it is obvious that I am the receiver.

However, in a textbook sentence, 私に is included because it clearly shows the grammar pattern.

Both can be possible, but they create slightly different emphasis.

• 先生は presents the teacher as the topic
• 先生が would identify the teacher more specifically as the subject / the one who did it

So:

• 先生は私に新しい辞書をくださいました。
  = As for the teacher, he/she gave me a new dictionary.

• 先生が私に新しい辞書をくださいました。
  = It was the teacher who gave me a new dictionary.
  (more focus on who gave it)

In many basic contexts, は sounds more neutral and topic-based.

It is past tense.

The dictionary form is くださる.
Its polite past form is くださいました.

Breakdown:

• くださる = to give (respectfully, to me/us)
• くださいました = gave (respectfully)

So the action happened in the past: the teacher gave the dictionary.

Yes, they are related, but they are used differently.

Both come from くださる.

• ください in 水をください means please give me water
• くださいました means gave me (past, polite, respectful)

So:

• 水をください。 = Please give me water.
• 先生は本をくださいました。 = The teacher gave me a book.

Same verb family, different grammar and usage.

Usually, no.

先生 is already a title, like teacher, doctor, or professor, and it is commonly used by itself when addressing or referring to someone.

So:

• 先生 = natural
• 先生さん = incorrect / unnatural

You can also attach a name before it:

• 田中先生 = Professor/Teacher Tanaka

But 先生 by itself is perfectly normal.

Yes, to some extent.

Because particles show each word’s role, Japanese word order is more flexible than English word order. The verb, however, usually stays at the end.

For example, these are possible:

• 先生は私に新しい辞書をくださいました。
• 先生は新しい辞書を私にくださいました。

Both are understandable.

That said, some orders sound more natural than others, and the original version is very standard and easy to follow.

Because it uses くださいました, which is both:

• polite
• respectful toward the giver

This matches the fact that the giver is 先生, a teacher.

Japanese often reflects social relationships through verb choice. When the giver is someone respected, using くださる / くださいました is appropriate.

If you used a plain form, it would be less polite:

• 先生が私に新しい辞書をくれた。

This is grammatically fine in casual speech, but much less polite in tone.

Yes. The use of くれる / くださる already centers the event around me or someone close to me.

That is one key difference from あげる.

So くださいました does not just mean gave in a neutral way. It means the action is viewed from the receiver side, specifically someone in the speaker’s in-group, often me.

That is why this sentence feels natural for The teacher gave me a new dictionary.