החייט משתמש במכונת התפירה כדי לתפור את הבטנה.

Because the verb להשתמש means to use and it normally takes the preposition ב־ after it.

So:

• להשתמש במשהו = to use something
• literally, it behaves a bit like to make use of in English

In this sentence:

• משתמש במכונת התפירה = uses the sewing machine

So the ב־ is not optional here; it is part of how the verb is used.

משתמש is the masculine singular present tense form of להשתמש.

Because the subject is:

• החייט = the tailor
  and חייט is masculine singular,

the verb also appears in masculine singular present form.

Other present-tense forms would be:

• משתמש = masculine singular
• משתמשת = feminine singular
• משתמשים = masculine plural / mixed plural
• משתמשות = feminine plural

So if the subject were התופרת (the seamstress), you would say:

• התופרת משתמשת...

It can mean either, depending on context.

Hebrew present tense often covers both:

• simple present: uses
• present progressive: is using

So this sentence could mean:

• The tailor uses the sewing machine... or
• The tailor is using the sewing machine...

You decide from the situation or the surrounding text.

Because מכונת התפירה is a construct chain (also called סמיכות), the standard Hebrew way to say sewing machine.

It is made of:

• מכונת = machine of...
• התפירה = the sewing

Together:

• מכונת התפירה = the sewing machine

In a construct chain, the first noun changes form and usually does not take ה־ directly.

So Hebrew says:

• מכונת התפירה = literally machine of the sewing

not:

• המכונה התפירה

which would be incorrect here.

That is how definiteness works in a construct chain.

In Hebrew, when two nouns are linked in this way:

• מכונת התפירה

the definiteness of the whole phrase is usually determined by the second noun.

So:

• מכונת תפירה = a sewing machine
• מכונת התפירה = the sewing machine

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

Here ב־ means something like with, by means of, or using.

So:

• במכונת התפירה = with the sewing machine / using the sewing machine

The preposition ב־ can have several meanings in Hebrew, including:

• in
• on
• at
• with / by means of

In this sentence, because of the verb להשתמש ב־, the meaning is clearly instrumental: using the sewing machine.

כדי means in order to.

So:

• כדי לתפור = in order to sew

This introduces the purpose of the action.

The sentence structure is:

• החייט משתמש במכונת התפירה = the tailor uses the sewing machine
• כדי לתפור את הבטנה = in order to sew the lining

Together:

• The tailor uses the sewing machine in order to sew the lining.

In everyday Hebrew, people also often say simply:

• לתפור את הבטנה without כדי, if the purpose is already obvious.

But כדי makes the purpose especially clear.

Because after כדי, Hebrew normally uses the infinitive.

So:

• כדי לתפור = in order to sew
• כדי לכתוב = in order to write
• כדי ללמוד = in order to study

The ל־ on לתפור is the infinitive marker, like to sew in English.

So this is not he sews or she sews. It is the infinitive: to sew.

Because הבטנה is a definite direct object.

In Hebrew, את is placed before a direct object when that object is definite, for example when it has:

• ה־ = the
• a proper name
• a possessive meaning

Here:

• הבטנה = the lining

So Hebrew says:

• לתפור את הבטנה

If the object were indefinite, you would usually leave out את:

• לתפור בטנה = to sew a lining

So את does not itself mean the; it marks a definite direct object.

הבטנה is a feminine singular noun meaning the lining.

Its basic form is:

• בטנה = lining

With the definite article:

• הבטנה = the lining

It is the direct object of לתפור:

• לתפור את הבטנה = to sew the lining

The given word order is very natural, but Hebrew does allow some flexibility.

The basic order here is:

• החייט = subject
• משתמש = verb
• במכונת התפירה = prepositional phrase
• כדי לתפור את הבטנה = purpose phrase

This is a very normal, clear order.

You might also hear variations for emphasis, but they are less neutral. For learners, the safest pattern is the one used here.

Yes, sometimes.

Hebrew often allows the infinitive alone to express purpose:

• החייט משתמש במכונת התפירה לתפור את הבטנה

But כדי לתפור is more explicit and often feels clearer, especially in careful or standard phrasing.

So both can work, but:

• כדי לתפור = very clear in order to sew
• לתפור alone = also possible in many contexts

Only the present-tense verb would need to agree with the feminine singular subject.

For example:

• החייטת משתמשת במכונת התפירה כדי לתפור את הבטנה.

Changes:

• החייט → החייטת = the female tailor / seamstress
• משתמש → משתמשת

The rest of the sentence stays the same.

Yes, literally that is how the structure works.

Hebrew often expresses noun combinations through a construct chain rather than using an adjective-like noun modifier.

So English:

• sewing machine

becomes Hebrew:

• מכונת תפירה = machine of sewing
• מכונת התפירה = the sewing machine

This is very common in Hebrew, and learning to recognize these noun chains is important.