Saving the earth（The Fifth Period）

        (show the following on the screen.)
 1. in the construction there be for existence                                e. g. there are some books on the table.
       there's a boy in the classroom.
 note: some other verbs can be used with “there” besides “to be”, such as:       live, exist, remain, come, arise, appear, enter, follow and so on.
      e. g. there came shouts for help from the river.                          '.             there remains nothing to be done.
2. when the sentence begins with one of the adverbs, such as here, there, now,   then, out, away, up, down, off, back, over.
  e. g, there goes the bell!
         in rushed the children.
  note: when the subject is a personal pronoun, inversion can't be used.
  e. g. there he comes.
         out he ran.
3. when the sentence begins with “such” for referring back, which means personor thing of a special kind.
  e. g. such was albert einstein.
         such are the facts.
  note: the predicate must agree with the subject after it in person and number.4. when the sentence begins with a long adverbial expression of place, especiallya prepositional phrase denoting place.
  e. g. between the two buildings stands a tall tree.
        south of the city lies a steel factory.
  note: some intransitive verbs like “come”“lie”“stand”“walk” often follow
  after the adverbial expressions of place.
5. the whole or part of the direct speech is placed at the beginning, followed by
  verbs of reporting like “answered john”“said the old lady”, which tell you who spoke or how they spoke.
  e. g. “help!” shouted the boy.
       “i've had enough ,”said john.
  note: ①when the subject is a pronoun, the verb normally comes after it.
  e. g. “you are,”i answered.
  ②when the verb of reporting is followed by an indirect object or an adverbial, the verb normally comes after the subject, inverted  word-order is impossible