1. A list of occasions on which Americans give tips has been given, culminating in:
... 出かける時にドアマンがタクシーを呼び止めてくれれば、それに対してチップ、というよ うに、何度もチップを取られる。
a) Is くれれば the conditional passive form of くれる, meaning "if (one) is given (the favour of having the taxi called by the doorman)"? [Edited: sorry, I don't think it can be passive?]