Conditions

command /setblock :
    description: set the block at your crosshair to a different type
    trigger:
        player cannot build at the targeted block:
            message "You do not have permission to change blocks there!"
            stop
        set the targeted block to argument

player can fly

block can hold 200 cobblestone
player has enough space for 64 feathers

if the player can't see the player-argument:
    message "The player %player-argument% is not online!"

chance of 50%:
    drop a diamond
chance of {chance}% # {chance} between 0 and 100
chance of {chance} # {chance} between 0 and 1

the clicked block is a stone slab or a double stone slab
time in the player's world is greater than 8:00
the creature is not an enderman or an ender dragon

block contains 20 cobblestone
player has 4 flint and 2 iron ingots

# make players use their potions of fire resistance whenever they take any kind of fire damage
on damage:
    damage was caused by lava, fire or burning
    victim is a player
    victim has a potion of fire resistance
    cancel event
    apply fire resistance to the victim for 30 seconds
    remove 1 potion of fire resistance from the victim
# prevent mobs from dropping items under certain circumstances
on death:
    entity is not a player
    damage wasn't caused by a block explosion, an attack, a projectile, a potion, fire, burning, thorns or poison
    clear drops

on click:
    if event is cancelled:
        broadcast "no clicks allowed!"

{teams::%player's uuid%::preferred-team} is not set
on damage:
    projectile exists
    broadcast "%attacker% used a %projectile% to attack %victim%!"

if the player has custom weather:
    message "Your custom weather is %player's weather%"

if player has metadata value "healer":

player has permission "skript.tree"
victim has the permission "admin":
    send "You're attacking an admin!" to attacker

player has played on this server before
player hasn't played before

if the targeted armor stand has the scoreboard tag "test tag":

{villager-buddy::%player's uuid%} is dead

player is banned
victim is not IP-banned
"127.0.0.1" is banned

on damage of player:
    victim is blocking
    damage attacker by 0.5 hearts

# increased attack against burning targets
victim is burning:
    increase damage by 2

steak is edible
player's tool is edible

player's inventory is empty

tool of the player is enchanted with efficiency 2
helm, chestplate, leggings or boots are enchanted

wood is flammable
player's tool is flammable

player is not flying

player is holding a stick
victim isn't holding a sword of sharpness

if chunk at {home::%player's uuid%} is loaded:

on region enter:
    player is the owner of the region
    message "Welcome back to %region%!"
    send "%player% just entered %region%!" to all members of the region

player is online
player-argument is offline

player is poisoned:
    cure the player from poison
    message "You have been cured!"

player is riding a saddled pig

script is loaded
script "example.sk" is loaded

# cut your enemies' throats in their sleep >=)
on attack:
    attacker is holding a sword
    victim is sleeping
    increase the damage by 1000

command /slimey:
    trigger:
        if chunk at player is a slime chunk:
            send "Yeah, it is!"
        else:
            send "Nope, it isn't"

# prevent mobs from seeing sneaking players if they are at least 4 meters apart
on target:
    target is sneaking
    distance of target and the entity is bigger than 4
    cancel the event

grass block is solid
player's tool isn't solid

player is not sprinting

player is swimming

glass is transparent
player's tool is transparent.

player is wearing an iron chestplate and iron leggings
player is wearing all diamond armour

player is in "world"
argument isn't in world "world_nether"
the player is in the world of the victim

tool is of type {selected type}
victim is of type {villager type}

player is not on ground

PvP is enabled
PvP is disabled in "world"

player is in the region {regions::3}
on region enter:
    region contains {flags.%world%.red}
    message "The red flag is near!"

if the argument starts with "test":
    send "Stop!"

command /command-with-cooldown:
    trigger:
        {command::%player's uuid%::last-usage} was less than a minute ago:
            message "Please wait a minute between uses of this command."
            stop
        set {command::%player's uuid%::last-usage} to now
        # ... actual command trigger here ...

is thundering
is raining in "world" or "world2"