句中有一个先行词,那么就只能用一个关系副词；如果有两个先行词,那么就可以用两个关系副词.如：
He didn't tell me the time when we would go for a spring outing.他没跟我说我们什么时候去春游.He didn't tell me the time when and the place where we would go for a spring outing.他没跟我说我们何时何地去春游.
句中有一个先行词,那么就只能用一个关系副词；如果有两个先行词,那么就可以用两个关系副词.如：
He didn't tell me the time when we would go for a spring outing.他没跟我说我们什么时候去春游.He didn't tell me the time when and the place where we would go for a spring outing.他没跟我说我们何时何地去春游.