1.They'll be taking some exercise.

　　2.This house must be at least 1oo years old.

　　3.The bus must have gone .

　　4.He can't have remembered.

　　5.You must be joking.

　　6.Maybe he has too much money.

　　7.I guess he'll fail the exam.

　　8.They're predicting a good harvest this year.

　　9.There is much probability that he can be saved.

　　10.I suppose he could have gone to Europe.

　　Dialogue One

　　A:Dear,can you drive me to the clinic?

　　B:I'm afraid I can't .

　　A:Why?

　　B:Well, my car won't start.I don't know what's the matter with it.

　　A:Could it be the battery?

　　B:No, I don't think it could be.I checked the battery two days ago.It must be other problems.

　　A:Well, I suppose it could be the gas.

　　B:No,there is plenty of gas.I filled it up yesterday.

　　A:Perhaps it's the starter then?

　　B:Yes,that's possible.

　　Dialogue Two

　　A:What's this, I wonder?

　　B:I'm not sure.Let me have a look.....It could be a coffee grinder.

　　A:A coffee grinder?

　　B:Yes,it must be used for grinding coffee beans.

　　A:Oh,that would be very useful.

　　Dialogue Three

　　A:Have you seen that house?

　　B:Yes,it looks interesting.

　　A:You're right.I love it very much.

　　B:It must be old.

　　A:At least more than 100 years old.

　　B:Let's enter it!

　　A:I can't open the door.

　　B:It must be locked.

　　A:Let me ask the old woman in that reception office.

　　B:She can't answer you.

　　A:She must be deaf.

　　B:It must be a haunted house.Are you frightened?

　　A:Frightened?You must be joking.

　　Dialogue Four

　　A:What was that noise?

　　B:It was the pilot putting the wheels down.We must be coming into land.Are you frightened?

　　A:Frightened?You must be joking!

　　Dialogue Five

　　A:John's very late.Do you think he's coming?

　　B:Well, it doesn't seem like it.He must have forgotten.

　　A:I suppose you're right.He can't have remembered.

　　Dialogue Six

　　A:Watch out!You'll hit that car if you're not careful.

　　B:Oh no,I won't .But we will have an accident if you don't stop shouting.

　　A:You see.I told you you'd hit him if you weren't careful.

　　B:Oh,shut up,will you?It was all your fault.If you'd kept quite this would never have happened.

　　A:Oh,so it was my fault,was it?If I hadn't warned you in time it would have been much worse.

　　老奶奶的生日礼物

　　The little boy,Johnnie,had been up with a packet of mints,and said he wouldn't go out to play until the post card came."I guess you'll get lots and lots of presents,"he said."I did last week when I was six."

　　What would she like?A pair of slippers perhaps.Or a new cardigan.A cardigan would be lovely.Blue's such a pretty color.Jim had always liked her in blue.Or a table lamp.Or a book,a travel book,with pictures,or a little clock,with clear black numbers.So many lovely things.