不标志任何时态,什么时态都能用.
He's never been to Australia.（完成时）他从来没去过澳大利亚.
I'm never going back there again,not as long as I live.（将来时）我再也不回去了
It is never too late to give up smoking.（一般现在时）戒烟永远都不晚.
I never knew you played the guitar!（过去时）我从来都不知道你弹吉他