Shall/Should - Free english lesson
Chapter The modals

In the first person singular and plural, « shall » allows us to express the future. We use « shall » in an accurate language or to express politeness. Generally, we prefer « will » instead, in order to form a future sentence.
I shall return.

« Shall » allows us to impose an obligation.
You shall not pass.

« Should » is used to give a piece of advice.
You should tie your shoes.

« Should » allows us to express the quasi-certainty.
He should be home now.

« Should » is also used in the first person singular and plural to form the conditional.
If I had a baby, I should quit smoking.

If we use « should » after the conjunction « if » or after « in case », we refer to an uncertain action.
If you should go to Paris, can you send me a postcard for my collection?
Make your suitcase in case we should leave.

« that + should » expresses a suggestion.
I think that I should work harder.
He suggests that you should download the last version of this software.

« Should » is used to state a judgment.
It's likely that he should stop soccer.
It's impossible that he should be there tonight.
It's unfair that I should go to bed now.

Progress in english with the story of the Lacoste family.
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