例如：1）Ihave just finished my homework.2）Mary has been ill for three days., so far, up to now, many times, up to the present等。
2时间状语:yesterday， this morning， just now， a moment ago， in May， last night / year / week， once upon a time， the other day， before等等。
九种基本时态1.一般现在时概念: 表示经常发生的动作或经常存在的状态。常和 always , often , usually , sometimes , every day 等表时间的状语连用。如：1) I go to school every day . 我每天都去学校。
