Beri ubat cacing itu esok.

Because this is an imperative sentence, meaning it is giving a command or instruction.

In Malay, the subject you is usually left out in commands, just like in English:

• Give that worm medicine tomorrow.
• Beri ubat cacing itu esok.

So the understood subject is you, even though it is not stated.

Beri is the form commonly used for a direct command.

Compare:

• beri = give! / to give
• memberi = to give, giving

In commands, Malay often uses the simpler base form:

• Beri ubat itu. = Give the medicine.
• Ambil buku itu. = Take that book.

Using memberi here would not sound right for a normal command.

Ubat cacing is a noun phrase meaning worm medicine or deworming medicine.

Breakdown:

• ubat = medicine
• cacing = worm

Malay often puts nouns together like this, where the first noun is the main thing and the second noun describes its type or purpose.

So ubat cacing literally means something like medicine for worms.

In Malay, demonstratives such as ini and itu usually come after the noun phrase, not before it.

So:

• ubat cacing itu = that worm medicine
• buku ini = this book
• rumah itu = that house

This is different from English, where this and that come before the noun.

It refers to the whole noun phrase ubat cacing.

So:

• ubat cacing itu = that deworming medicine

It does not mean the worm that medicine or anything like that. In Malay, itu comes after the full noun phrase it modifies.

Esok means tomorrow, and in Malay, time expressions are often placed at the beginning or the end of a sentence.

So these are both possible:

• Beri ubat cacing itu esok.
• Esok, beri ubat cacing itu.

Putting esok at the end is very natural and keeps the focus first on the action: Give that worm medicine tomorrow.

It is grammatical, but it can sound fairly direct because it is a plain command.

If you want to sound softer or more polite, Malay often adds words like:

• Tolong beri ubat cacing itu esok. = Please give that worm medicine tomorrow.
• Sila beri ubat cacing itu esok. = Please give that worm medicine tomorrow. / Kindly give that worm medicine tomorrow.

So the original sentence is fine, especially in instructions, but it is not the softest possible version.

Yes, you can, depending on style.

• Beri ubat cacing itu esok.
• Berikan ubat cacing itu esok.

Both can mean Give that worm medicine tomorrow.

In general:

• beri is shorter and very common in everyday speech
• berikan can sound a bit more formal or complete

A learner will often hear beri very frequently in spoken Malay.

It is not stated in this sentence. Malay often leaves out information that is already understood from context.

So Beri ubat cacing itu esok just means:

• Give that worm medicine tomorrow

But it does not say to whom.

If needed, Malay can add the recipient, for example:

• Beri ubat cacing itu kepada kucing itu esok. = Give that worm medicine to that cat tomorrow.

Yes, some variation is possible.

For example:

• Beri ubat cacing itu esok.
• Esok beri ubat cacing itu.

Both are natural.

But the noun phrase itself normally stays together:

• ubat cacing itu = that worm medicine

You would not usually split it up in unnatural ways.

Malay nouns usually do not show singular vs. plural unless the context makes it clear.

So ubat cacing could mean:

• worm medicine
• worm medicines

In this sentence, English would most naturally translate it as singular: that worm medicine. But the Malay form itself does not force singular in the same way English does.

Yes. A very common pattern for commands in Malay is:

Verb + object + time / other details

So here:

• Beri = verb
• ubat cacing itu = object
• esok = time expression

This makes the sentence compact and natural. Malay often avoids extra words that English might need, especially in simple instructions.