tā shàngbān zǒngshì hěn zhǔnshí, cónglái bù chídào.

Not necessarily. In Chinese, when an adjective acts as the main predicate of a sentence, 很 is often used even when the speaker does not want to emphasize very.

So:

• 她很准时 often just means She is punctual
• it does not always mean She is very punctual

In this sentence, 很准时 is the natural way to say is punctual / is on time. If you said 她上班总是准时, it is possible, but it can sound a bit more marked depending on context.

Because this sentence describes a habitual pattern, not one specific past event.

• 不迟到 = is not late / does not arrive late
• 没迟到 = was not late / didn’t arrive late for a particular occasion

Here the sentence says she always does this and never does that, so 不 is the correct negation:

• 从来不迟到 = is never late

If you were talking about one day, you might say:

• 她今天没迟到。 = She wasn’t late today.

上班 commonly means to go to work, to be at work, or to start work, depending on context.

In this sentence, 她上班总是很准时 means something like:

• She is always on time for work
• She always gets to work on time

So 上班 is not just the place work; it refers to the activity of going to or being at one’s job.

They are both adverbs, but they work differently.

• 总是 = always
• 从来 usually appears with a negative word, especially 不 or 没, to mean never

So:

• 总是很准时 = always punctual
• 从来不迟到 = never late

A useful pattern is:

• 总是 + positive statement
• 从来不 + verb/adjective

Examples:

• 他总是很忙。 = He is always busy.
• 他从来不喝咖啡。 = He never drinks coffee.

Because the subject is understood to be the same as in the first clause.

The full version could be:

• 她上班总是很准时，她从来不迟到。

But repeating 她 is unnecessary, so Chinese often leaves it out when the subject is obvious.

This is very common in Chinese, especially when two clauses clearly refer to the same person.

Chinese adverbs usually go before the part they modify.

Here, 总是 modifies 很准时, meaning she is always punctual when it comes to work.

So the structure is roughly:

• 她 | 上班 | 总是 | 很准时
• She | when going to work / at work | always | punctual

If you said 她总是上班很准时, it sounds less natural because 总是 would seem to modify 上班 itself, as if stressing that she always goes to work, rather than that she is always punctual for work.

So the given sentence is the more natural phrasing.

In this sentence, 准时 functions like an adjective meaning punctual or on time.

That is why it can appear after 很:

• 很准时 = punctual / very punctual, depending on context

But 准时 can also behave adverbially in other sentences:

• 他准时到了。 = He arrived on time.

So it is a flexible word, but here you can think of it mainly as an adjective.

Normally, 不 is pronounced bù with a fourth tone.

But before another fourth-tone syllable, it changes to bú in pronunciation.

Since 迟到 is pronounced chídào, and 到 is fourth tone, 不迟到 is pronounced:

• bú chídào

The character stays the same; only the pronunciation changes in speech.

Yes, but that is less common in everyday beginner-level usage.

Most learners first meet:

• 从来不... = never...
• 从来没... = have never...

That is the most useful pattern to remember.

In some contexts, 从来 can mean something like always or all along, especially in more formal or literary styles, but for everyday conversation, it is safest to learn:

• 从来 + negative = never

So in this sentence, 从来不迟到 is a very standard and natural expression.

Not exactly. They are similar, but not the same.

• 总是 = always
• 常常 = often

So:

• 她上班总是很准时 = she is punctual every time
• 她上班常常很准时 = she is often punctual, but not necessarily always

Because the second clause says 从来不迟到 (never late), 总是 matches the meaning better.

They are very close in meaning, but using both makes the statement stronger and more natural.

• 总是很准时 emphasizes the positive side: she is always punctual
• 从来不迟到 emphasizes the negative side: she is never late

Together, they reinforce each other and create a smooth, natural sentence. Chinese often uses this kind of pairing for emphasis and clarity. It sounds stronger than using only one of them.