1 Standard Action = 1 Segment (or Combat Round) = 10 Seconds

Actions in Combat Table

Standard Action Attack of Opportunity1
Attack (melee) No
Attack (ranged) Yes
Attack (unarmed) Yes
Activate a magic item other than a potion or oil No
Aid another Maybe2
Bull rush Yes
Cast a spell (1 standard action casting time) Maybe
Concentrate to maintain an active spell Maybe
Dismiss a spell No
Draw a hidden weapon (see Sleight of Hand skill) No
Drink a potion or apply an oil Yes
Escape a grapple No
Feint No
Light a torch with a match Yes
Lower spell resistance No
Make a dying friend stable (see Heal skill) Yes
Overrun No
Read a scroll Yes
Ready (triggers a standard action) No
Sunder a weapon (attack) Yes
Sunder an object (attack) Maybe3
Total defense No
Turn or rebuke undead No
Use ability No
Use skill that takes 1 action Usually
Use spell-like ability Yes
Use supernatural ability No

Move Action Attack of Opportunity1
Move Yes
Control a frightened mount Yes
Direct or redirect an active spell No
Draw a weapon4 No
Load 2 bullets Maybe
Load a crossbow Yes
Open or close a door No
Mount a horse or dismount No
Move a heavy object Yes
Pick up an item Yes
Sheathe a weapon Yes
Stand up from prone Yes
Ready or loose a shield4 No
Retrieve a stored item Yes

Full-Round Action Attack of Opportunity1
Full attack No
Charge5 No
Deliver coup de grace Yes
Escape from a net Yes
Extinguish flames No
Light a torch with flint & steel Yes
Load a heavy or repeating crossbow Yes
Lock or unlock weapon in locked gauntlet Yes
Prepare to throw splash weapon Yes
Run Yes
Use skill that takes 1 round Usually
Use touch spell on up to six friends Yes
Withdraw5 No

Free Action Attack of Opportunity1
Cast a quickened spell No
Cease concentration on a spell No
Drop an item No
Drop to the floor No
Prepare spell components to cast a spell6 No
Speak No

Not an Action Attack of Opportunity1
Delay No
5-foot step No
Action Type Varies  
Disarm7 Yes
Grapple7 Yes
Trip an opponent7 Yes
Use Skill8 Varies
1 Regardless of the action, if you move out of a threatened square, you usually provoke an attack of opportunity. This column indicates whether the action itself, not moving, provokes an attack of opportunity.
2 If you aid someone performing an action that would normally provoke an attack of opportunity, then the act of aiding another provokes an attack of opportunity as well.
3 If the object is being held, carried, or worn by a creature, yes. If not, no.
4 If you have a base attack bonus of +1 or higher, you can combine one of these actions with a regular move. If you have the Two- Weapon Fighting feat, you can draw two light or one-handed weapons in the time it would normally take you to draw one.
5 May be taken as a standard action if you are limited to taking only a single action in a round.
6 Unless the component is an extremely large or awkward item.
7 These attack forms substitute for a melee attack, not an action. As melee attacks, they can be used once in an attack or charge action, one or more times in a full attack action, or even as an attack of opportunity.
8 The description of a Skill defines its effect.