*1是用来补足的意义,表明的性状的.
*2在{主动}句中只与连用.
#2-1
We are students.
我们是学生.
students是,与are连用.
#2-2
It is getting dark.
天快黑了.
dark是,与is getting连用.
*3可用于句中.
#3-1
He is called David.
他叫大卫.
David是,与is called连用.
*1是用来补足的意义,表明的性状的.
*2在{主动}句中只与连用.
#2-1
We are students.
我们是学生.
students是,与are连用.
#2-2
It is getting dark.
天快黑了.
dark是,与is getting连用.
*3可用于句中.
#3-1
He is called David.
他叫大卫.
David是,与is called连用.