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As is the case with other English tenses, questions and negative statements in the PastPerfect tense are formed using the auxiliary.Questions are formed by placing the auxiliary before the subject. For example:Affi rmative StatementI had worked.They had worked.Qu estionHad I worked?Had they worked?Negative statements are formed by placing the word not after the auxiliary. Forexample:Affi rmative StatementI had worked.They had worked.Negative StatementI had not worked .They had not worked.In spoken English, the following contraction is often used:Without Contractionhad notWith Contractionhadn"tNegative questions are formed by placing the auxiliary before the subject, and the wordnot after the subject. However, when contractions are used, the contracted form ofnot follows immediately after the auxiliary. For example:Without ContractionHad I not worked?Had they not worked?With ContractionHadn"t I worked?Hadn"t they worked?Tag questions are formed using the auxiliary. In the following examples, the negativetag questions are underlined. Contractions are usually used in negative tag questions.Affi rmative StatementI had worked.They had worked.Affi rmative Statement with Tag Qu estionI had worked, hadn"t I?They had worked, hadn·t they?See Exercises 5 and 6.4. The past perfect continuousa. UseThe Past Perfect Continuous tense is used to refer to a continuous, ongoi ng action inthe past which was already completed by the time another action in the past tookplace. In the following examples, the verbs in the Past Perfect Continuous tense areunderlined.e.g. I had been waiting for two months by the time I received the reply.He had been thinking about his friends shortly before they called.