should or would?
The same general pattern is true here as for shall and will. As an auxiliary verb, would is more usual than should when stating a condition or proposition and is the only choice when asking a question (They would like to come.I would think so.Would you like to go to the movies?). Should has the special role of denoting obligation, validity, or likelihood (I should stay until they arrive.Should you be lifting that?That should be our visitors now.) and must be used in inverted constructions expressing a condition: Should it rain, the party will be held indoors.Would is required when referring to habitual past action: On Wednesdays I would go to the library. In conversational English, the contracted forms I'd, you'd, etc., are regularly used instead of the full forms in making simple statements (They'd like to come), but these cannot be used in place of should in its senses of obligation or likelihood.
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