Past Perfect Continuous form
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             Grammar 
            Past Perfect Continuous diagram Past Perfect Continuous form Past Perfect Continuous use Past Perfect Continuous signal words  | 
          Exercises Past Perfect Continuous | 
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Past Perfect Continuous Tense is built with had been in all persons and present participle. 
 
| Affirmative sentences | contractions | |
|---|---|---|
| I / You / He / She / It / We / They | I / You / He / She / It / We / They had been writing a letter. | I'd been writing a letter. | 
| Negative sentences | contractions | |
|---|---|---|
| I / You / He / She / It / We / They | I / You / He / She / It / We / They had not been writing a letter. | I hadn't been writing a letter. | 
| Questions | |
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| I / You / He / She / It / We / They | Had I / you / he / she / it / we / they been writing a letter? |