Ateacher（is）inchargeofaclassiscalledaclassteacher.就是十分疑惑（is）是要还是不要,定语从句就不要be动词了吗?

Question

A teacher （is） in charge of a class is called a class teacher.
就是十分疑惑（is）是要还是不要,定语从句就不要be动词了吗?

Answer 1

不要.A teacher in charge of a class is called a class teacher./ A teacher who is in charge of a class is called a class teacher. 前者是介词词组修饰a teacher,后者是定语从句.定语从句也是个句子,是从属地...