一：for+时间段；since+时间点

TheyhavelivedinBeijingforfiveyears.

TheyhavelivedinBeijingsince1995.

IhavelearnedEnglishfortenyears.

二：常见的不确定的时间状语：lately;recently,just,already,yet,uptonow;tillnow;sofar,thesedays,

Hasitstoppedrainingyet?

三：在表示“最近几世纪/年/月以来……”时间状语中，谓语动词用现在完成时。

inthepastfewyears/months/weeks/days；overthepastfewyears;

duringthelastthreemonths;forthelastfewcenturies,throughcenturies;throughouthistory等

四：表示“第几次做某事，”或在“Itisthebest(worst,most

interesting)+名词＋that”后面跟现在完成时。

ThisismyfirsttimethatIhavevisitedChina.

ThisisthemostinterestingfilmIhaveeverseen.

Thatistheonlybookthathehaswritten.