L5 unit 10 grammar

Yes! They have 2 sentences!

The 'if' sentence presents the CONDITION, and the other sentence the RESULT

Each sentence has a particular VERB TENSE

If a lioness has cubs to protect, she is more dangerous.

IF + PRESENT SIMPLE, PRESENT SIMPLE

To describe real events or situations that actually happen (true)

If a lioness has cubs to protect, she is more dangerous.

If people behave sensibly, wild animals aren't dangerous.

Only in the Zero Conditional, "when" means the same as "if"

IF + PRESENT SIMPLE, WILL/WON'T

To imagine what is likely to happen.

If a lioness thinks her cubs are in danger, she will attack.

If forests disappear, the weather will be more extreme.

IF + PAST SIMPLE, WOULD / WOULDN'T

To describe something imaginary.

If I had a garden, I would grow a lot of fruit.

If people cared about their planet, they wouldn't pollute the sea.

If "if" comes first, you need the comma.

You need the comma if "if" comes first.