Unit1 Tales of the unexplained—grammar教案

 look at the following sentences and point out what tense or tenses are used in them and the reasons why they are used.  a we have studied english for about five years. we began to study it five years ago . b they moved to the south in 1990 and have lived there since then.c eric left home last year and has just come back. e justin has been away from home for several days. he disappeared last friday. f they bought this house three years ago and they have lived here since then. g my brother went to see my grandpa last week. he has visited him three times this month.complete the following sentences :  a ‘have you seen my pen?’ ‘yes, i saw it on your desk just now.’  b ‘have you had dinner?’ ‘yes, i had it with mary.’  c has the postman come yet/this morning?  d did the postman come this morning?  e i have known him for a long time.  f hello! i didn’t know you were here in nanjing. how long have you been here?notes:1)the present perfect tense is normally used for an action which lasts throughout an incomplete period, but with the past simple tense, we use time expressions which a fixed point in the past.c.f. we haven’t seen justin for a week.(he is still missing.) justin disappeared last week.(it may mean that this week justin is here.) he has smoked since he left school.(he still smokes.) he smoked for six months.(it means that he stopped smoking then.  2) sometimes, however, the action finishes at the time of speaking.it has been very cold lately but it’s just beginning to get warmer.3)on meeting someone, you may say: i haven’t seen you for ages.(but i see you now.)4) for a past action whose time is not definite and often has a result in the present.tom has had a bad car crash.(he’s probably still in hospital now.)tom had a bad car crash.(but he’s probably out of hospital now.)the lift has broken down.(we have to use the stairs.)the lift broke down.( but it’s probably working again now.)5  read the diary entry and then complete it using the correct forms of the verbs in brackets.  answers: (2) saw  (3) has visited (4) loves  (5) hasn’t visited  (6) has swum  (7) has never met  (8) has dived  (9) has found   (10) hasn’t found   (11) has, been 6 assignmentperiod two   present perfect continuous tense teaching aim:
to give a brief introduction to the present perfect continuous tense