am/is/are(be)
keep
seem
appear
become
feel
get
grow
remain
smell
look
sound
taste
stay
go
ask
find
see
hear
make
have
watch
want
I found that the homework was diffcult.
–> I found the homework diffcult.
四大词性和句子七类成分的对应关系:
从句和并列句。