问题补充：
如果是要表示将来的情况或者是虚拟的呢,例如这个句子Once he makes up his mind to do something no one can hold him back.
这个是条件句：主将从现：
一旦你许了诺,就要遵守.
因为对现在有影响,而且发生在过去,所以要用完成时.
once的用法Once you have made a promise,you must keep it.这里once后
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