1.who's=who is

　　2.she's = she is

　　3.he's = he is

　　4.what's = what is

　　5. where’s= where is

　　6.we're = we are

　　7.you're = you are

　　8.that's = that is

　　9. I'm = I am

　　10. isn't = is not

　　11.aren't = are not

　　12.they're = they are

　　13.don't = do not

　　14.let's = let us

　　15. can’t = can not

　　16. it's = it is

　　17. I’ve = I have

　　18. I’d = I would

　　19. hasn’t = has not

　　写出下列单词的复数形式：

　　1.bus —— buses

　　2.box —— boxes

　　3.glass —— glasses

　　4.class —— classes

　　5.watch —— watches

　　6.mango —— mangoes

　　7.firefly —— fireflies

　　8.sheep —— sheep

　　9.people —— people

　　10.man —— men

　　11.woman —— women

　　12.apple —— apples

　　13.family —— families

　　14.library —— libraries

　　15.baby —— babies

　　16.boy —— boys

　　17.toy —— toys

　　18.child —— children

　　19.foot —— feet

　　20.strawberry —— strawberries

　　21.horse —— horse

　　22.policeman —— policemen

　　23.dress —— dresses

　　24. fish —— fish

　　25.tooth —— teeth

　　26.country —— countries

　　27. foot —— feet

　　28.dragonfly —— dragonflies

　　29.me —— us

　　30.building —— buildings

　　31. cloth —— clothes

　　32. this —— these

　　33. that —— those

　　34.circle —— circles

　　35.story —— stories