so far,for several times,since,recently,these days,in the last few years,for+时间段,since then,once/twice/three times,already,yet,before,up to now,just,never,still.
请问哪些是现在完成时的标志时间词?lots of times算不算?
so far,for several times,since,recently,these days,in the last few years,for+时间段,since then,once/twice/three times,already,yet,before,up to now,just,never,still.