तोहफ़ा कमरे में छिपाओ।

Because में is a postposition, and many masculine singular nouns in Hindi change form before a postposition.

• Base form: कमरा = room
• Before a postposition: कमरे
• So: कमरे में = in the room

This is called the oblique form.
A lot of masculine nouns ending in -ा do this:

• लड़का → लड़के में / लड़के को / लड़के का
• कमरा → कमरे में

So कमरे में is the correct form, not कमरा में.

में usually means in, inside, or within.

So:

• कमरे में = in the room

Hindi uses postpositions, not prepositions. That means the equivalent of English in comes after the noun, not before it.

Compare:

• English: in the room
• Hindi: room in → कमरे में

Hindi normally prefers Subject–Object–Verb word order, so the verb often comes last.

In this sentence:

• तोहफ़ा = the gift
• कमरे में = in the room
• छिपाओ = hide

So the structure is:

Object + place + verb

This is very normal in Hindi. English often puts the verb earlier, but Hindi usually saves it for the end.

छिपाओ is an imperative form, used for giving a command or instruction.

The base verb is छिपाना, meaning to hide.

From that verb, छिपाओ means something like:

• hide
• hide it
• you should hide

In this sentence, it is telling someone to do the action.

It is usually associated with तुम-level speech, which is informal but not the most rude.

Very roughly:

• छिपा → for तू (very intimate / very casual / can sound rude)
• छिपाओ → for तुम (informal, common)
• छिपाइए or छिपाइये → for आप (polite/formal)

So तोहफ़ा कमरे में छिपाओ। sounds like you are speaking to someone you would address as तुम.

Yes, many speakers use both छिपाना and छुपाना in everyday Hindi.

So you may hear:

• तोहफ़ा कमरे में छिपाओ।
• तोहफ़ा कमरे में छुपाओ।

Both are commonly understood as hide the gift in the room.

In many contexts, the difference is small or nonexistent in everyday speech. Learners should mainly recognize both forms.

तोहफ़ा means gift or present. It is a very common word.

Another very common word is उपहार, but that sounds a bit more formal or literary in many contexts.

So:

• तोहफ़ा = common, everyday
• उपहार = more formal

Also, तोहफ़ा is a masculine noun.

No, not in the way a past-tense adjective-like verb form might.

Here छिपाओ is an imperative command, so it is based on who is being addressed, not on the gender of तोहफ़ा.

So whether the object were masculine or feminine, the command form could still stay the same:

• किताब कमरे में छिपाओ।
• तोहफ़ा कमरे में छिपाओ।

The imperative here does not change because of the object’s gender.

तोहफ़ा is pronounced roughly like toh-fa.

A few pronunciation notes:

• तो sounds like toh
• ह is lightly pronounced
• फ़ is like f
• ा at the end gives an aa sound

In everyday speech, some speakers may pronounce फ़ more like a plain फ, especially depending on accent. So you may hear something closer to tohfa with either a true f sound or a softer Hindi ph/f-like sound.

Hindi usually does not use articles like English a, an, and the.

So तोहफ़ा can mean:

• a gift
• the gift

And कमरे में can mean:

• in a room
• in the room

The exact meaning depends on context. Hindi often leaves that information unstated unless it needs to be made explicit.

To make it more polite, use the आप form of the imperative:

• तोहफ़ा कमरे में छिपाइए।

This is a polite/formal command.

You may also see छिपाइये, which is a common spelling variant.

So the levels are roughly:

• छिपा = very casual/intimate
• छिपाओ = informal
• छिपाइए = polite/formal

A common way is:

• तोहफ़ा कमरे में मत छिपाओ।

Here मत means don’t in a command.

Structure:

• तोहफ़ा = the gift
• कमरे में = in the room
• मत = don’t
• छिपाओ = hide

So मत is placed before the verb.

Yes.

• कमरे में = in the room
• कमरे के अंदर = inside the room

कमरे के अंदर is a bit more explicit about being physically inside.
In many situations, though, कमरे में is enough and sounds more natural and simpler.

So both can work, but कमरे में is the basic, everyday way to say it.