Should In Subordinate Clauses

In formal British English, should is often used in that-clauses after certain nouns and adjectives. Examples of such nouns and adjectives are: important, necessary, vital, essential, eager, anxious, concerned and wish. As you may have noticed, most of them refer to the importance of an action.

Certain verbs expressing similar ideas can also be followed by that-clauses with should.

In American English, this use of should is unusual. Subjunctives may be used instead.

Should in if-clauses

Should can be used in if-clauses. This structure is used to suggest that something is unlikely.

Should after in case

After in case, we often use should + infinitive. This structure is used to add the meaning ‘by chance’.