Healtheworld
swfOurEarth_________(change)alot
There________(be)manynaturaldisastersinthelastfewyears
Forexample,aseriousearthquake______(hit)Wenchuanin2008,andmanypeople______(lose)theirlives
Weshouldtryourbesttoprotecttheenvironmenttohealtheworld
Ifwedonothing,people_________(have)nowheretolive
haschangedhavebeenhitlostwillhaveAdverbialsofTimeandContexts时间状语和语境对时态的影响Fillintheblankswiththerightformoftheverb:They_______(drive)toworksometimes
already
tomorrow
yesterday
whentheysawtheaccident
bythetimeIvisitedthem
drivearedrivinghavedrivenwilldrivedroveweredrivinghaddrivenDifferentadverbialsoftimeresultindifferenttenses
TensesFormsAdverbialsoftimeSimplepresentPresentcontinuousPresentperfectSimplepastPastcontinuousPastperfectSimplefuturewas/weredoinghaddoneV
(原形/三单)am/is/aredoinghave/hasdo