♦ 'Should' is the past tense of the word 'shall.' When using the words 'should have' you are talking about something in the past that you 'ought to' or 'might have' done.

Examples:

1. I should have gone with you.
2. I should have studied more for my test.
3. I should have read the directions before starting.
4. I should have eaten breakfast this morning.
5. I should have listened to your advice.
6. I should have married her when I had the chance.

► 'Shall' is something that will take place or exist in the future.

Examples:

1. I shall leave tomorrow.
2. I shall finish the job next week.
3. I shall see it tomorrow.
4. I shall go outside if it's nice out.
5. I shall pay for this later.