时间状语：典型的表时间的词与现在完成时连用
与for、since、already、yet、ever、never、recently、just、before、sofar、bynow、…等连用.
注意:for+一段时间since+过去的某一个时间点
IhavelivedinNanningfortenyears.
IhavelivedinNanningsincetenyearsago/2002.
Ihaven’teatenanythingfortenhours.
Ihahaven’teatenanythingsince6am.
already:用于肯定句,可放在助动词之后、过去分词之前，也可放在句末.
Ihavealreadyfinishedmyhomework.
yet:用在疑问句中意为”已经”,用在否定句中表示”还”,常放在句末.
Haveyoufinishedyourhomeworkyet?
Ihaven’tfinishedmyhomeworkyet.
ever:曾经用于疑问句中：
HaveyoueverbeentoBeijing?
HaveyoueverbeentoShanghai?
你去过上海吗?
never:未曾从未
Ihavenevertraveledbyplanebefore.
我以前从来没有乘飞机旅行过.
recently：最近用于肯定否定疑问句中
Ihavebeenbusyrecently.
WehavenotseenTomrecently.
Havetheybeenhererecently.