यह खाँसी का सिरप है।

Hindi often puts a modifying phrase before the noun it describes.

Here, खाँसी का सिरप means cough syrup literally syrup of cough:

• खाँसी = cough
• का = of
• सिरप = syrup

So the whole sentence is structured like:

• यह = this
• खाँसी का सिरप = cough syrup
• है = is

Literally: This cough-of syrup is.

That is the natural Hindi way to build this noun phrase.
You could say यह सिरप खाँसी का है, but that would sound more like This syrup is for cough or This syrup belongs to the cough category, which is a slightly different emphasis.

यह means this.

In careful spelling, it is written यह, but in everyday speech it is often pronounced more like yeh. So learners usually hear:

• यह → yeh

Hindi has two common demonstratives:

• यह = this
• वह = that

In speech, these are often heard as:

• यह → yeh
• वह → voh

So यह खाँसी का सिरप है is naturally pronounced something like:

yeh khaansi ka sirap hai

का is a possessive/postpositional word that often means of.

In खाँसी का सिरप, it links खाँसी and सिरप:

• खाँसी = cough
• का = of
• सिरप = syrup

So literally: syrup of cough.

This is a very common Hindi pattern for forming compound noun phrases:

• सेब का रस = apple juice
• बच्चों की किताब = children’s book
• चाय का कप = cup of tea

So खाँसी का सिरप is just the standard Hindi way to say cough syrup.

Good question. का / की / ke change according to the gender and number of the noun that comes after them, not the noun before them.

The noun being described here is सिरप. Hindi treats सिरप as masculine singular, so the correct form is:

• का

Compare:

• खाँसी का सिरप = cough syrup (सिरप is masculine singular)
• खाँसी की दवा = cough medicine (दवा is feminine singular)
• खाँसी के इलाज = treatments for cough (इलाज here would require the plural/appropriate agreeing form depending on structure)

So का agrees with सिरप, not with खाँसी.

सिरप is a borrowed word, from English syrup.

Hindi uses many loanwords, especially for modern objects, medicine, technology, and everyday urban speech. Borrowed words are usually written in Devanagari to match Hindi pronunciation.

So:

• English syrup
• Hindi सिरप

You may also hear English words used directly in Hindi speech, especially in cities. But सिरप is a normal and understandable Hindi form.

खाँसी is pronounced roughly like khaan-see.

Break it down:

• खा = khaa
• ँ adds nasalization
• सी = see

So it sounds approximately like: khãa-see / khaan-see

A few key points:

• ख is an aspirated k sound, like a k with a strong puff of air.
• ाँ shows a nasalized vowel.
• सी sounds like see.

For an English speaker, a reasonable approximation is: khaan-see

The sign ँ is called chandrabindu. It nasalizes the vowel.

So:

• खा = khaa
• खाँ = a nasalized khaa, something like khaã

This nasalization is an important part of pronunciation in many Hindi words. In practice, some learners first pronounce खाँसी as khaansee, which is close enough to be understood, but it is good to notice that the vowel is nasalized.

You may also see ं in Hindi, which is a different nasal sign called anusvār, though in actual pronunciation the distinction can sometimes blur in everyday speech.

Hindi usually places the verb at the end of the sentence. This is one of the basic differences from English.

English:

• This is cough syrup.

Hindi:

• यह खाँसी का सिरप है।
• literally: This cough syrup is.

So है comes last because Hindi normally follows subject/object/complement + verb order.

This sentence pattern is extremely common:

• यह किताब है। = This is a book.
• वह डॉक्टर है। = He/She is a doctor.
• यह दवा है। = This is medicine.

है means is.

It is the present-tense form of the verb होना = to be.

In this sentence, it simply links the subject and the description:

• यह = this
• खाँसी का सिरप = cough syrup
• है = is

So the sentence means This is cough syrup.

Some related forms are:

• हूँ = am
• है = is
• हैं = are / is (formal or plural)

Examples:

• मैं डॉक्टर हूँ। = I am a doctor.
• वह यहाँ है। = He/She is here.
• वे यहाँ हैं। = They are here.

No. Hindi does not normally use articles like English a, an, or the.

So यह खाँसी का सिरप है does not contain a separate word for a or the. The meaning is understood from context.

Depending on context, it could be translated as:

• This is cough syrup
• This is a cough syrup
• This is the cough syrup

In natural English, This is cough syrup is usually the best translation, but Hindi itself does not force that distinction the way English does.

Yes, in some contexts यह can function a bit more broadly than English this.

Hindi demonstratives often do double duty. यह can mean:

• this
• he / she / it when the person or thing is near, present, or being referred to in a certain way

For example:

• यह मेरा दोस्त है। = This is my friend. / He is my friend.
• यह मेरी किताब है। = This is my book. / It is my book.

In your sentence, यह is most naturally this, because the speaker is identifying an object:

• यह खाँसी का सिरप है। = This is cough syrup.

Yes, absolutely.

यह खाँसी की dवा है means This is cough medicine.

The difference is:

• खाँसी का सिरप = cough syrup
• खाँसी की दवा = cough medicine

Here की is used because दवा is feminine:

• दवा = feminine singular
• so the agreeing form is की

So both are correct, but they mean slightly different things:

• सिरप is specifically syrup
• दवा is a more general word for medicine

It is neutral and completely natural.

It would sound normal in everyday situations such as:

• at a pharmacy
• at home
• in a doctor’s office
• when identifying a bottle of medicine

It is neither especially formal nor especially casual. It is just a straightforward statement.

If you wanted to be more formal in a medical or written context, you might use more technical vocabulary, but for everyday Hindi this sentence is very standard.