in the past few years是不是现在完成时的标志

是的。

recently, recent years, these days/years, lately, since, for +一段时间 , in the past few years, ever since, in the last five months, up to now, since then, so far, ever never, yet, lately, once, twice, three/four times..., already, before, just.

这些词都是可以再现在完成时中见到的。但并不只出现在现在完成时语句中。

要判断一个句子是否是现在完成时，关键在于看句意是单单陈述过去发生的客观事实，还是从过去开始一直持续到了现在，或者是对现在有影响。

如果只是陈述过去发生的事情，与现在无关，就用一般过去时，如果是后者就用完成时。

是，already ,yet , since , so far(到目前为止) up to now(到目前为止) recently. in the past /last years在过去的几年中it is the first/second....time sb +现在完成时如，it is my first time I have been here.

是
already yet just recently still lately in the past few days/weeks/months/years up to present so far up to now till now等