The paradigm for 'shall/will' is as follows:Originally Posted by jiang
I shall/, you will, s/he will, it will, they will, we shall
I should, you would, s/he would, it wouls, they would, we should
'shall/should' is used for 1st person singular and plural, whereas 'will/would' is used for all the other persons and numbers.
Please note, 'shall' has merged with 'will' in American English:
I would be more careful If I were you.
I wouldn't have done it if it hadn't been necessary.