Animals in danger教案

t: excellent! now i want to change these sentences. look carefully, please.
show the following.
1.  to watch a movie is interesting.
2.  to eat vegetables is good.
3. to hear the accident is sad.
t: maybe you have found something different. what’s the function of “to do”?
s: as the subject of the whole sentence.
t: great! that’s it. we can use the infinitive to work as the subject of the whole sentence. but how come these sentences “it’s + adj. + to do”? well, do you want to have a big, long head and short legs? maybe that will look uncomfortable. so we need our old friend “it” to help us. thus we have all these sentences.
then ask students to read the following aloud.
1.  it is interesting to watch a movie.
2.  it’s good to eat vegetables.
3.  it’s sad to hear the accident.
t: ok. now let’s go on with the next sentence “it’s not hard to learn english.” clearly it’s the negative form of the infinitive. how is it formed?
s: to add “not” before the infinitives.
t: yes, so change the sentences above into negative ones.
s: 1. it’s not interesting to watch a movie.
2. it’s not good to eat vegetables.
3. it’s not sad to hear the accident.
t: well, the next type. look at sentence3 “i was surprised to see you here.” and it’s just easy for you to give other examples.
s: he was afraid to tell his mother the matter. i’m glad to hear you.
t: this time the infinitive functions as adverbial in the whole sentence.
then give the students some examples.
1. she was ready to go.
2. you’re right to do it.
3. the water is not good to drink.
ask students to read these sentences together. and then go on to the next type.
t: “we need to finish our homework every day.” the infinitive is used as the object of the main verb. many verbs can be followed by infinitives. such as: learn, tell, forget, remember, decide, ask, try, like, need, etc.
show the following.
eg: we learn to speak english every day.
   mary forgot to give me my book.
   helen decided to have a holiday.
we’ll learn the usage of the verbs and you should pay attention to the usage. ok, next type, as attribute. i think you’re familiar with it.
s: there is a house to live in.
  we have something to discuss.
  would you like something to drink?
t: well, the last type, infinitives as predicatives. for example:
1. my only wish is to be a good teacher.
2. the important thing is to finish it on time.
3. the first thing was to open the door.