What to put in the IF block and what to put in the ELSE block?

if (condition) then
{
   // do stuff
}
else
{
   // do other stuff
}

if (!condition) then
   {
     // do other stuff
   {
   else
   {
     // do stuff
   }

if (condition)
    return;

DoSomething();

bool MyFunc(variable) {
    if (variable != something_i_want)
        return false;

    // a large block of code
    // ...
    return true;
}

if (!some_function_that_could_fail())
  {
     // Error handling code
  }
  else
  {
     // Success code
  }

if (somePositiveCondition)
else {
    //stuff
}

if DataIsGood() then
   DoMyNormalStuff
else
   TakeEvasiveAction

if SomeErrorTest then
  TakeSomeEvasiveAction
else if SomeOtherErrorCondition then
  CorrectMoreStupidUserProblems
else if YetAnotherErrorThatNoOneThoughtOf then
  DoMoreErrorHandling
else
  DoMyNormalStuff

if (blah == false)
{
    return; // perhaps with a message
}

// do rest of code here...

if (not_dead) {
} else {
}

if (alive) {
} else {
}

if (!alive) {
} else {
}

if (dead || (!dead && sleeping)) {
} else {
}

if (dead || sleeping) {
} else {
}

if( common ) {
    // pass
}
else {
    // great big block of exception-handling folderol
}

if( ! common ) {
    // great big block of except-handling folderol
}

if (!PreserveData.Checked)
{  resetfields();}

if (!widget.enabled()) {
     // more common
   } else {
     // less common
   }

if (widget.disabled()) {
     // more common
   } else {
     // less common
   }

if (expected)
{
   //expected path
}
else
{
   //fallback other odd case
}

unless ($foo) {
    $bar;
}

//if you must have multiple exit points, put them first and make them clear
if TerminatingCondition1 then
  Exit
if TerminatingCondition2 then
  Exit

//now we can progress with the usual stuff
if NormalThing then
  DoNormalThing
else
  DoAbnormalThing

unless (alive) {
     go_to_heaven;
} else {
     say "MEDIC";
}