单 元：unit 1 tales of the unexplained
板 块：grammar and usage 1
thoughts on the design:
learn the grammar present perfect tense and present perfect continuous tense.
teaching objectives:
1. learn how to form and use the present perfect tense.
2. understand when the present perfect continuous tense is used in sentences.
teaching procedures:
step 1 lead- in
go over the news story on page 2 and find the sentences using the present perfect tense. please explain why the tense is used in these sentences.
step 2 present perfect tense
1. the form of the present perfect tense: has/have done.
2. talk about the uses of the present perfect tense.
a. we use the present perfect tense to talk about things that happened in the recent past, but are connected to the present. 表示过去发生的事对现在仍有影响。
the disappearance of justin has made kelly very unhappy.
(justin在过去失踪，但kelly至今仍旧为他的失踪感到不高兴。)
b. we also use the present perfect tense to talk about something that started in the past, and is still happening now. 表示过去开始的动作一直延续到现在。
i have not seen justin since last friday night. (从上周五晚上到现在一直都没有见到过。)
c. we use the present perfect tense when the exact time of an action is not clear or important. we use it with time expressions such as:
already ever for just lately never recently since yet
exercise: complete the following sentences with the proper tense.
(1) we have studied (study) english for about five years.
(2) they have lived (live) in the south since their daughter was born.
(3) i have read (read) your article three times. it’s well written.
(4) the student has finished (finish) her homework already.
(5) eric has just gone (go) back to his hometown.
we use already for affirmative statements and yet for negative statements.
we use for + a period of time and since + a point in time.
d. we use the present perfect tense to talk about actions that were completed only a short time ago. in this case, just is used. pay attention to the position of just.
the police have just finished searching the area.
e. we can also use the present perfect tense for repeated actions, that is, we use the present perfect tense with the time expressions once/twice/three times…
3. read the diary entry and then complete it using the correct forms of the verbs in brackets.
answers:
(1) saw (2) has visited (3) loves (4) hasn’t visited (5) has swum
(6) has never met (7) has dived (8) has found (9) hasn’t found (10)
