If I can’t help her, how you can expect to?

When I was in the Diplomatic, things were much better. But I hear they let them in now by examination. What can you expect? Examinations, sir, are pure humbug from beginning to end. (O. Wilde. The Portrait of Dorian Gray)

• You can / can’t imagine sth and You can / can’t imagine how / what / why ... are used to emphasise how good, bad, etc. it is;

You can imagine how angry I was!

You can’t imagine what a terrible week we had!

• as far as sb can remember is used for telling someone what you remember of a situation;

No one got drunk as far as I can remember.

• You can’t have hear yourself think is to emphasise how noisy a place is;

Just shut up, Tom. I can’t hear myself think.

• I can’t say (that) is used to say that you do not think or feel something;

I can’t say I envy her being married to Paul.

• I couldn’t say is used when you don’t know the answer to something;

I couldn’t say who is who.

• you can say that again is used to say that you completely agree with someone;

– It’s cold in here. – You can say that again!

• Who can say? is used to say that nobody can know something;

Who can say what will happen between now and then?

• can’t say fairer than that is used to say that you have made the best offer that you can;

– If I win, I’ll buy you a drink. – Can’t say fairer than that.