1.Are you certain about that?

2.Were you quite sure about your success?

3.Really?

4.I suppose you have no doubt about that.

5.I've no doubt of your ability.

6.I bet they've got lost.

7.I'm quite convinced things will improve.

8.It's hard to tell.

9.That's my conviction.

10.I cann't dicide when to start.

Dialogue 1

M:Where were you last night, at exactly 9:20PM?

w:9:20pm,I couldn't say.I cann't remember.

M:Are you sure you cann't remember?

W:I've absolutely certain.

M:Were you in or out?Can you remember that?

W:I'm not quite positive.I think I went out at about half pass nine.

M:Did you see anyone come into the block flats?

W:No, I didn't.

M:Sure?

W:Quite sure.

Dialogue 2

W:Are you sure this is the right resteurn。

M:Positive。

W：You don't think you could be wrong?

M:I'am absolutely sure I'm right.

W:I don't know.It looks a little wrong down.

M:This is right.There is no doubt in mind.

W:You're hundred percent sure you want to eat here?

M:Check and double check.

Dilogue 3

M:Do you think they two will get married?

W:You can count on it.

M:I think so.Yes, they get along so well.

W:I like him.He's good for her.

M:You're right. He sure is.

Dialogue 4

W:I'm exhausted. My new exercise is so hard,

M:I think it is easy.I could work in your calss with no problem.

W:You thing so?

M:Oh, without doubt.When is the next calss?

W:Tomorrw morning.Try it.

M:No problem.

W:Are you going to this calss this morning?

M:Of course,easy.No sweat.

W:You're no able to move after this class.

M:Are you kidding me?It's going to be up a piece of cake.

W:You want to bet?

M:Yeah,what't the bet?

W:I bet I can go one hour in your class this morning and not feel a thing.

Dialogue 5

M:You say he was around average hight.

W:Yeah,that's right, around five nine five ten.

M:Weight?

W:I'm not sure.Medium，I suppose.Maybe a little on the heavy side.

M:Any karks on his face?

W:No, I don't think so.

M:Glasses?

W:No.

M:what about his hair?

W:Black or dark brown.

M:Long or short? Straight?Curly?

W:Straight, I think, and about average length.

M:Boy, this surely doesn't help us much.It could be anybody.How about his cloth?What was he wearing.

W:Well, he had a Jacked or a Plage shirt. You know the kind of number jack wear.

M:Ok, now we are getting some where.Pants?

W:Dark, maybe dark blue maybe black.I'm not sure.

M:What kind of shoes?

W:Boots

M:Cow while Boots.

W:No, hiking boots. Brown ones.

M:All right. That nealy done a little.

M:Now I want you to look some pictures.

Dialogue 6

M:Well,what about it?As it happens I've got two ticktes for next thursday evening.I sought perhaps.

W:Well, thanks all the same, Denise. But no I don't think.Sorry, I'm sure you would enjoy it.I'd like to Denise, but I,m busy on friday this week and next week too.

M:But I said thursday.The tickets are for thursday evening.

W:Thursday?Oh,sorry.I meant thrusday too.I mean I busy then too.

M:I see.Oh, well some other time perhaps.

W:Yes. some other time perhaps.Thanks again.

If your are a teacher, are your sure that the student with good greads will be successful person in the future.And are you sure that slow student will be also slow in his whole life.I'm not sure about it.Absolutely not.I had a student in all the teacher's agreed that he was absolutely slowest student we have ever had.He sopkes slowly, moves slowly and row slowly. We suspected that he thought slowly, but he could proud add the type of daughter to his name in six years.So I believe one sentence forever-If at first you don't succeed it try and try again.Yes, I'm sure about this.You may also remember this.