分析介绍unit 13 section a 2课件.pdf

GrrFocus

Wearetrytosavetheearth.Presentprogressive

Theriverusedtobesoclean.usedto

Theairisbadlypolluted.Passivevoice

Noscientificstudieshave

shownthatsharksfinsarePresentperferct

goodforhealth.

Weshouldsavethesharks.Modelverbs

4aFillintheblankswiththecorrectforms

oftheverbsinbrackets.

Havetaken

Joe:_____youever_____(take)partinan

environmentalproject?

helped

Ken:Yes,Ihave.I_____(help)withaClean-Up

considered

Daylastyear.Itwas_______(consider)

thebiggestclean-upprojectthiscityever

hadhad

______(have).

Joe:Howmanypeople______(take)part?

took

think

Ken:I_____(think)morethan1,000people

came

_____(come)tohelpout.

Joe:That’sfantastic!Iguesseveryoneinthiscity

trying

is_____(try)toimprovetheenvironment.

wait

Ken:Yes,wecan'taffortto_____(wait)any

longertotakeaction!

4bFillintheblankswiththeappropriate

modalverbsfromthebox.

cancouldwouldhaveto

shouldmustmay/might

People_____thinkthatbigthings_____be

mayshould

done.However,manyforgetthatsavingthe

earthbeginswithsmallthings.For

could

example,you_____saveelectricityby

turningoffthelightswhenyouleavea

room.You_w_o_u_l_dalsousepaperorreusable

bagsinsteadof