to agree we can use the following expressions.

neutral:
yes, l agree,
true enough,
that's qiute right.
l couldn't agree more,
informal:
yes,
right,
dead right,
well that's the thing
you're right,
l'm with you there,
formal:
l agree entirely
l'm of exactlythe same opinion.
TO DISAGREE we can use the following the expressions.
neutral:
l dont agree
l cant agree
not realy
l dont think that's right.
informal:
no way.
never!
never!
nonsense!
you cant be serious!
 you must be joking.
formal:
l entirely disagree...
l cant accept...

to calm some one who is angry we can use the following expressions.

neutral:
pleas don't worry.
there's nothing to worry about,
informal:
relax
don't worry
take it easy
cheer up!
come on!
it's ok.
formal:
l assure you everything is all right.
you need to have fears about that.

to show anger we can use the following expressions.

neutral:
oh no!
oh dear!
oh brother!
what's a nuisance!
informal:
oh. hell, no!
oh< that"s great!
damn!
bloody hell!
formal:
this is extremely irritating.
l can't say l'm at all pleased.

l can't say l'm at all pleased

to ask permission we can use the following expressions.

neutral:
may l use your computer?
can l use your computer pleas?
could l use your computer/?
do you mind if l use your computer?
informal:
let me use your computer, would you?
ok, if l  usse your computer?
let me use your computer, would you?
formal:
can l have your permission to use your computer?
do you have any objections if l open the door?

neutra;
well, because my computer is out of order.
well, you can see any computer is out of order.
let me explain. you see my computer is aout of order.
informal:
welll, the thing is my computer is out of order.
it's  like this, you see my computer is out of order
formal:
the main reason is that my computer is out of order.
if l could explain, my computer is out of order.

to attract someone's attention, we can use the following expressions.

neutral
excuse me!
informal:
hey!
look!
listen!
formal:
may l have your attention, pleas!
atettion pleas!
TO SHOW attention we can use the following expressions.
neutral;
really?
l see
informal:
oh!oh?
well, well!
tell me more about it!
formal:
indeed?

to show surprise we can use the following expressions

neutral:
do you realize that..
informal:
suprisingly...
believe it or not...
formal
you may not believe it, but...

for certain and uncertainly we can use the following expressions

neutral:
i'm sure..
l'm quiet sure..
l've no doubt about...
informal:
yes
sure
absolutely for certain
formal:
it's quite certain..
that is my conviction

FOR UNCERTAINTY we can use the following expressions
neutral:
l'm not sure.
l'm not really sure
l can't decide..
informal:
l can't say for certain
l couldn't say
formal:
there is surely some doubt....

to check certainly we can use the following expressions

neutral:
are you sure about that?
are you certain about that?
informal:
realy?
definitely?
you're sure?
positive?
formal:
forgive me, but are you sure about...?
so you mean to say..?