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You asked which boy did it.She wants to know what he has done.He wonders to whom we shall send it.I wonder which questions she answered.Please tell me for which child you bought it.The verb to be is accompaniedby a noun or pronoun complementThe verb to be usually followsits complement. Examples:He will ask who their friends are.I wonder what that was.Do you know what time it is?Please tell me which book it was.However, in the case of which,the verb to be often precedes anoun complement. For example:I wonder which i? the right answer.See Exercise 12.5. Relative pronounsA pronoun which is used to begin a subordinate clause can be referred to as a relativepronoun, since it indicates the relationship of the subordinate clause to the rest of thesentence.For instance, the underlined words in the following sentences are relative pronouns.e.g. The woman who is standing near the window is a doctor.The door, which was bright red, was very conspicuous.Have you found the book that was missing?A subordinate clause which is introduced by a relative pronoun is often referred to as arelative clause.a. Defining and non-defining relative clausesRelative clauses can be divided into two types: those which merely give a description ofthe object to which they refer, and those which define or identify the object to whichthey refer.i. Non-defining relative clausesWhen a relative clause merely describes an object without having the function ofdefining or identifying to which object the speaker or writer is referring, the clausemust be placed between commas. Such a clause can be called a non-defining or nonlimitingrelative clause.For instance, in the example:The door, which was bright red, was very conspicuous.