if: making a choice

if temperature > 25:
    say "Warm"
else:
    say "Cool"

The condition must evaluate to Boolean. Pliro has no truthiness conversion.
The else clause is optional.

There is no elif or one-line else if form. Nest another if in the else
block:

if score >= 100:
    say "Gold"
else:
    if score >= 50:
        say "Silver"
    else:
        say "Bronze"

Example

# language: en
let score = 12
if score >= 10:
    say "A"
else:
    say "B"