May siga sa kampo.

Here, may is an existential word. It tells you that something exists / is present somewhere.

A very common pattern is:

may + noun + location

So May siga sa kampo follows a basic Filipino pattern meaning there is/are + something + in/at some place.

Because may already does that job.

In English, you need There is a ... or There are .... In Filipino, may can cover that idea by itself, so you do not need a separate verb like is in this kind of sentence.

After may, the noun normally comes without ang.

So:

• May siga sa kampo. = natural
• May ang siga sa kampo. = not natural / incorrect

This is just part of the grammar pattern: may + noun.

Sa kampo is a location phrase meaning in the camp, at the camp, or sometimes to the camp, depending on context.

In this sentence, it marks the place where the siga is.

A useful thing to know is that sa is broader than any one English preposition. It can correspond to in, at, on, or to, depending on the sentence.

May siga sa kampo is the most straightforward, neutral order.

A common pattern is:

may + thing + place

You can sometimes move the location earlier for emphasis, such as Sa kampo may siga, but May siga sa kampo is the basic version a learner should get comfortable with first.

They are closely related, but they are not used in exactly the same way in every situation.

Before a noun, may is very common and very natural:

• May siga sa kampo.

You may also hear:

• Mayroong siga sa kampo.
• Merong siga sa kampo.

These are also understandable, but may is the simplest and most common form before a noun.

Yes. Siga can be context-dependent and may have more than one meaning, including a slang meaning in some contexts.

So if your lesson already gives one intended meaning, follow that meaning for this sentence. Just be aware that the same word may be understood differently in another context.

Use wala or walang, not hindi may.

So the negative version is:

Walang siga sa kampo.

That means there is no siga in/at the camp.

This is a very important pattern:

• May ... = there is / there are
• Walang ... = there is no / there are no

If you want to make the noun clearly plural, you can add mga:

May mga siga sa kampo.

So:

• may siga = there is a siga / there is some siga
• may mga siga = there are several siga

Whether plural sounds natural depends on the exact meaning of siga in your context, but grammatically this is how Filipino usually marks plural nouns.