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f. 'It...that.'

Two constructions, closely allied, but grammatically distinct, are often confused: (i) Antecedent 'it' followed by a defining relative clause with 'that' (who, which); (ii) 'it' followed by a clause in apposition, introduced by the conjunction 'that'. The various correct possibilities are represented in the set of examples given below. Relative clauses are marked R, conjunction clauses C. One impossible example is added in brackets, to mark the transition from relative to conjunction.

In the relative construction, the antecedent 'it' is invariable, whatever the number and gender of the relative. The main verb is also invariable in number, but in tense is usually adapted to past, though not (for euphony's sake) to future circumstances: 'it was you that looked foolish', but 'it is you that will look foolish'.

In both constructions, the 'that' clause, supplemented or introduced by 'it', gives us the subject of a predication, the