语法

Introductory it as Subject

5.4 it V n when/if

The verb is followed by a noun group and a clause beginning with when or if, which indicates a situation that occurs or may occur. The noun group is the Complement in group 1 and the Object in group 2.
itVerb groupnoun groupwhen/if clause
SubjectVerbComplementClause
Itishis tough luckif he doesn't understand the risks.
It'sthe team's problemif they're not strong enough.
itVerb groupnoun groupwhen/if clause
SubjectVerbObjectClause
Itupsetsmewhen you say things like that.
Itwouldn't surprisemeif she left.
Verbs with this pattern belong to the following meaning groups:
The 'be' groupThe 'amuse' and 'irritate' groupVerbs with other meanings

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