did
went
jumped
had
played
drank
listened
studied
cleaned
read(读音不一样)
small short
weak low
old young
go white
here right
warm open
good front
down.
1.it is
2.what is
3.is not
4.who is
5.that is
6.let us
注意：let's 是let us的缩写,意思是让我们……
isn't i'm
it's you're
can't what's
let's don't
who is are not
that is have not
does not she is
we are
最后一个不知道