H. P. Grice: A. I intend to go to that concert on Tuesday. B. You will enjoy that. A. I may not be there. B. I am afraid I don't understand. A. The police are going to ask me some awkward questions on Tuesday afternoon, and I may be in prison by Tuesday evening. B. Then you should have said to begin with, 'I intend to go to the concert if I am not in prison', or, if you wished to be more reticent, something like, 'I should probably be going', or, 'I hope to go', or, 'I aim to go', or, 'I intend to go if I can'.

A. I intend to go to that concert on Tuesday.

B. You will enjoy that.

A. I may not be there.

B. I am afraid I don't understand.

A. The police are going to ask me some awkward questions on Tuesday afternoon, and I may be in prison by Tuesday evening.

B. Then you should have said to begin with, 'I intend to go to the concert if I am not in prison', or, if you wished to be more reticent, something like, 'I should probably be going', or, 'I hope to go', or, 'I aim to go', or, 'I intend to go if I can'.