תקופת החשבון מסתיימת מחר.

Because תקופת is the construct form of תקופה.

In Hebrew, when two nouns are linked as X of Y, the first noun often changes into a special form called the construct state (סמיכות). So:

• תקופה = a period
• תקופת החשבון = the period of the account / the billing period

For many feminine nouns ending in ־ה, the ־ה changes to ־ת in the construct form. So:

• תקופה → תקופת
• compare also:
  • שנה → שנת
  • חברה → חברת

So תקופת החשבון is a noun pair meaning something like the account period or the billing period.

This is another feature of the construct state.

In a construct phrase, the definiteness of the whole phrase is usually marked on the second noun, not the first. So:

• תקופת חשבון = an account period / a billing period
• תקופת החשבון = the account period / the billing period

Even though תקופת itself does not have ה־, the whole phrase is definite because החשבון is definite.

That is very normal in Hebrew. The first noun in a construct chain usually does not take ה־.

Because the subject, תקופת החשבון, is grammatically feminine singular.

The main noun in the subject is תקופה, and תקופה is feminine. In Hebrew, present-tense verb forms agree with the subject in gender and number. So:

• masculine singular: מסתיים
• feminine singular: מסתיימת
• masculine plural: מסתיימים
• feminine plural: מסתיימות

Since תקופת החשבון is feminine singular, the sentence uses מסתיימת.

Grammatically, מסתיימת is the present-tense form.

However, Hebrew often uses the present tense for something that is scheduled, expected, or imminent, especially when there is a time word like מחר.

So this sentence can naturally mean:

• The billing period ends tomorrow
• or The billing period is ending tomorrow

If you wanted a more explicitly future form, you could say:

• תקופת החשבון תסתיים מחר

That also means The billing period will end tomorrow.

So the sentence you were given is natural, and the use of the present with מחר is not unusual.

מסתיימת comes from the verb להסתיים, which means to end, to come to an end, or to be concluded.

A few useful forms are:

• infinitive: להסתיים = to end / to come to an end
• past, masculine singular: הסתיים = ended
• present, masculine singular: מסתיים = ending
• present, feminine singular: מסתיימת = ending
• future, masculine singular: יסתיים = will end
• future, feminine singular: תסתיים = will end

In this sentence, מסתיימת agrees with תקופת, which is feminine singular.

חשבון is a very common Hebrew word with several meanings depending on context, including:

• account
• bill
• invoice
• sometimes even calculation or math

In the phrase תקופת החשבון, the most natural meaning is usually something like:

• billing period
• account period
• statement period

The exact English translation depends on the situation: banking, utilities, subscriptions, phone service, and so on.

Hebrew usually does not use a present-tense form of to be the way English does.

In English, you say:

• The billing period is ending tomorrow

In Hebrew, the present-tense verb form itself is enough:

• תקופת החשבון מסתיימת מחר

So Hebrew does not need a separate word for is here.

Yes. Hebrew word order is fairly flexible, especially with time expressions like מחר.

Your sentence:

• תקופת החשבון מסתיימת מחר

is a neutral, natural order: subject + verb + time.

But you could also say:

• מחר תקופת החשבון מסתיימת

That puts more emphasis on tomorrow.

The original version is probably the most straightforward one for a learner.

A simple pronunciation guide is:

T'kufat ha-cheshbon mistayemet machar

A slightly more careful transliteration would be:

T'kufat ha-ḥeshbon mistayemet maḥar

A few notes:

• תקופת = t'ku-fat
• החשבון = ha-chesh-bon
• מסתיימת = mis-ta-ye-met
• מחר = ma-char

The ch / ḥ sound in חשבון and מחר is the throaty Hebrew sound, like in Bach.

Yes, that is the literal structure.

Word-for-word, it is roughly:

• תקופת = period of
• החשבון = the account / the bill

So literally: the period of the account

But in natural English, that often becomes:

• the billing period
• the account period
• the statement period

So the literal structure is useful for understanding the grammar, but the best English translation depends on context.