when从句使用would, 表明说话人的意愿,即当我想哭的时候,类似用法也可以在if从句见到,如:If you will take these cases and decide them solely upon the evidence, I am sure you will have no difficulty in arriving at proper verdicts.主要would 这里可以理解为过去将来时用法,也可以理解为过去习惯。甚至你不用would,直接用you were always there也可以,但不如加上will/would 更正式。