1, Ability / Inability

Inquiring about …

Can you …?

Are you able to …?

Do you know how to …?

Can you …?

Is there any chance you could (possibly) …?

Would you be able to …?

You'd consider yourself an experienced …?

You'd say you're an experienced …?

Expressing Ability

I can …

I'm (very) good at ___ ing.

I've had a lot of experience ___ing.

I've had a good/great deal of experience ___ing.

I've had years of experience ___ing.

I'm sure/I'm confident/I'm certain/ I know I'd be able to learn quickly.

I'm sure/I'm confident/I'm certain/ I know I could learn quickly.

Expressing Inability

I can't …

I won't be able to …

I'm not going to be able to …

I wasn't able to …

I couldn't …

I'm not sure I can.

I can't make it on …

I'm tied up on …

I'd like to/love to, but I'm afraid I can't.

There's nothing I can do about it.

There's no way I can get out of it.

I can't get out of it.

2, Advice / Suggestions

Asking for …

What do you think (I should do)?

Do you have any advice?

Any suggestions?

Any other suggestions?

Do you have any suggestions/recommendations/ideas/thoughts?

Can you recommend …?

I was wondering if you could recommend ...

I need your advice on something.

Offering ...

Can I offer you some advice?

Can I offer you a piece of advice?

Can I offer you a suggestion?

I (strongly) advise you to …

I urge you to …

I recommend that you …

I recommend ___ing.

You should (definitely) …

You ought to …

You must …

You'd better …

Make it a point to …

Be sure to … 

You should …

Why don't you …

How about ___ing?

I think you should/ought to …

I/I'd suggest that you … 

I/I'd suggest ___ing.

If I were you, I'd …

It seems to me (that) you should …

Don't you think you should …

Don't you think it would/might be a good idea to …

Maybe you ought to/should …

Maybe you should consider ___ing.

It might be a good idea to …

Why don't you …?

Have you considered ___ing?

Have you thought of ___ing?

Have you thought about …?

Have you given any thought to ___ing?

You might consider ___ing.

Why don't you …? 

You could (always) …

How about ___ing?

What about ___ing?

It might be a good idea to …

What if you ___ed?

What if you were to …?

I/I'd suggest …

I/I'd recommend … 

Let's …

What if we ___ed

Why don't we …?

We could (always) …

Would you be interested in ___ing?

Maybe we should … 

Maybe we shouldn't …

They say that … is very good.

One of my favorite ___s is …

Is … okay?

There's an advantage to ___ing

Take my advice!

Take it from me!

If you want my advice, …

Don't jump to conclusions!

Don't get (yourself) "all worked up."

Don't get carried away.

Don't let your imagination run away with you.

Don't read too much into what I'm saying!

Responding to …

(That's a/What a) good idea.

(That's a/What a) good suggestion.

That sounds good/great.

That sounds like a good idea.  

I hadn't thought of that.

That hadn't occurred to me.

That never entered my mind.

3, Agreement/Disagreement

Inquiring about ..

Wouldn't you agree (that) …?

Wouldn't you say (that) …?

Don't you think (that) …?

Expressing Agreement

I agree (with you).

You're/That's right.

That's/It's true.

I know.

I'll say!

You can say that again!

Absolutely!

Definitely!

No doubt about it!

Me, too. I think so, too.

I feel the same way.

Yes, indeed.

It sure is.

I ___  either.

That's just/exactly what I was thinking.

I couldn't agree with you more.

I feel the same way.

That's exactly what I think.

My feelings exactly.

You can say that again!

You took the words right out of my mouth!

You're probably right.

I suppose/guess you're right.  

I suppose/guess that's true.

That might/may be true.

You might/may be right.

You have a point (there).

I see your point.

I know.

Under the circumstances, I can see …

Given the circumstances, I can see …

Given the situation, I can see …

Expressing Disagreement

I disagree.

I don't agree.

I can't agree.

I don't think so.

I wish I could agree (with you), but …

I hate to disagree (with you), but …

I don't mean to disagree (with you), but …

I don't want to argue (with you) (about that), but …

I don't want to start/get into an argument (with you) (about it), but …

I'm not so sure (about that).

I don't know (about that).

I'm not sure (if) I agree (with you on that).

I wouldn't say that.

I wouldn't go as far as that.

I wouldn't go so far as to say that.

But/However, wouldn't you agree (that) __?

But/However, wouldn't you say (that) ______?

But/However, don't you think (that) .____?

We don't see "eye to eye" when it comes to …

4, Apologizing

I'm sorry.

Excuse me.

(Oh,) I'm sorry.

I apologize.

I'm sorry.

Please forgive me.

Please accept my apology.

I apologize for ___ing.

Forgive me for ___ing.

Sorry for ___ing.

I'd like to / I want to / I've got to apologize for ___ing.

I'm really/very/awfully sorry (about it).

I feel terrible (about it).

I (really) regret it.

I hope you'll forgive me.

Please forgive me.

You're going to have to forgive me.

I don’t mean to make things difficult/ complicated for you.

I don't mean to complicate things.

5, Appreciation

I appreciate it/that.

I'd appreciate it/that.

It's nice/kind of you to offer.

Thanks for offering.

I appreciate your offering.

That's (very) nice/kind of you.

That would be nice.

I really appreciate it.

I appreciate it very much.

It was very nice of you to …

I want to express my appreciation to …

I can't begin to tell you how much I appreciate …

You're very kind/nice.