必修三模塊四 Sandstorms in Asia學案

② infinitive structure acts as predicate
e.g. he is yet to come. (be + to come)
the important thing is to save lives.
③ infinitive structure acts as object.
e.g. she likes to play with the child.
    he seems to know the way.
④ the adjective followed by the infinitive structure
e.g. i am very glad to see you.
    he is eager to win.
⑤ infinitive structure acts as attribute.
e.g. he was always the first to come and last to leave.
    the next train to arrive was from new york.
⑥ infinitive structure acts as adverbial modifier.
e.g. i stayed there to see what would happen.
         (doing this with explanation)
step ii grammar 1
t: now please go through the activity 1 and to find all infinitive structures, then tell us if they give essential or extra information.
possible answers:
the wind is strong enough to move sand dunes.  the adjective followed by the infinitive structure
we were advised not to go outside. infinitive structure acts as object.
it’s frightening to be cycling to work in a sandstorm infinitive structure acts as subject
there is nothing to be done. infinitive structure acts as attribute
i am the only person in my family to have been in a sandstorm. infinitive structure acts as attribute
to have been caught in a sandstorm was a terrible experience. infinitive structure acts as subject
(ask students to check the answers)
ask students to finish activity 2&3 then call back the answers.
1. it is dangerous to travel during a sandstorm. infinitive structure acts as subject
2. experts hope to learn more about the movement of thunderstorms. infinitive structure acts as object.
3. we were told not to leave the house. infinitive structure acts as object.
4. the work on the house needs to be completed by the end of the week. infinitive structure acts as object.
5. most houses seem to have been destroyed by the storm. infinitive structure acts as predicate

1. to work  2. to learn 3. to tell 4. to be completed 5. to miss 6. to be finished 7. to see

explanation:
① some adjectives must be followed by “to”: glad, sorry, lucky, free, sure, likely, able, afraid, willing, ready, anxious, careful, foolish etc.
② have to means“不得不…….”
③ some verbs must be followed by “to” as objective：like, want, hope，expect, wish, try etc.
④ set phrases： so + adj.+ as to;  such (…) as to….;  … enough (for sb) to….; too……to…; only to…. ( 表示未曾料到的結果) etc.