If you switch it from attack position to defence position you can't because no monster can attack from defence position except from "Total defence shogun". But if you switch it from defence position to attack position then you can attack
Yes if you wait a turn
They 'can' attack directly, meaning they are free to attack the opponent's monsters instead if you wish.
You don't 'defend with' a monster in Yu-Gi-Oh, like you do in Magic the Gathering. The attacking player is the one who chooses what his monster battles against. The defending player does not get a choice in this, he is not able to switch the attack target, unless he has an effect that lets him do so.
Yes, if you control a monster in defense mode and it is changed to attack mode during the Battle Phase by a card effect, it can attack. The "Zero Gravity" Trap card is an example of a card that can switch your monsters' battle position during the Battle Phase. But if the monster already attacked that turn, was switched to defense mode, then changed to attack mode again by an effect, it cannot attack again on that same turn.
It doesn't matter who 'owns' the monster, all that matters is the current controller. If I steal your monster, and attack your other weaker monster with it, it's you who takes the damage because 'your' monster is 'mine' at the moment, no different to my other monsters. If you attack the stolen monster with a stronger one, the same applies, I control the weaker monster, so I take the damage.
You can switch it into attack mode, sure. But as long as it remains face-up on the field, it is affected by a condition applied by Silent Doom, saying that monster cannot attack.
Yes if you wait a turn
depends if the monster has any special conditions under "effects" if its a normal monster then yes you can attack after summoned if its an effect monster and it doesn't say anything where you have to wait then you can attack the same turn. Hope this helps
Not manually, no. A monster that has declared an attack that turn, may not switch into defence mode. But it can be switched by the effect of other cards, including their own, in the case of Goblin Attack Force.
Yes. Once per turn, a monster may switch from face-up attack mode to face-up defence mode, or vice-versa, as long as the monster was not summoned that turn, and had not declared an attack. If the monster is face-down, then turning it face up into attack mode is a Flip Summon, which can't be done on the turn the monster was Set from hand.
Yes. If your monster is in attack position and you attack a monster that has more attack points than yours, your monster is destroyed and you take Battle Damage to your Life Points equal to the difference between your opponent's monster's Attack Points and your monster's Attack Points.
of course
Answer taken from the Official English Rulebook: After you've announced your attacking monster and the attack target monster during a Battle Step, the attack target might be removed from the field, or a new monster may be played onto the opponent's side of the field before the Damage Step, due to a card's effect. This causes a "Replay." When this occurs, you can choose to attack with the same monster again, or choose to attack with a different monster, or choose not to attack at all. Note that if you attack with a different monster, the first monster is still considered to have declared an attack, and it cannot attack again this turn.
A monster in face-down Attack position is unable to declare attacks. It can be flipped or Flip Summoned, both actions will switch it into face-up Attack position. It can also have its battle position change by the controlling player, switching it from face-down Attack position to face-down Defence position.
They 'can' attack directly, meaning they are free to attack the opponent's monsters instead if you wish.
No it does not. Brain control is used to either switch its position on the controller of brain control's side of the field or tribute this controlled monster or attack with.
Raging Flame Sprite Has To Attack A Monster First To Attack Your Opponent Directly.