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V-ing form
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Perfect
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V-ing perfect
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Negation
Simple form
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V-ing form
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Perfect
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V-ing perfect
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Interrogative form
Simple form
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V-ing form
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Perfect
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V-ing perfect
may I have been discovering? may you have been discovering? may he have been discovering? may we have been discovering? may you have been discovering? may they have been discovering?
Interro-negative form
Simple form
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V-ing form
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Perfect
mayn't I have discovered? mayn't you have discovered? mayn't he have discovered? mayn't we have discovered? mayn't you have discovered? mayn't they have discovered?
V-ing perfect
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