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Form mit V-ing
I could be discovering you could be discovering he could be discovering we could be discovering you could be discovering they could be discovering
Perfekt
I could have discovered you could have discovered he could have discovered we could have discovered you could have discovered they could have discovered
Perfekt mit V-ing
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Negation
Einfache Form
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Form mit V-ing
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Perfekt
I couldn't have discovered you couldn't have discovered he couldn't have discovered we couldn't have discovered you couldn't have discovered they couldn't have discovered
Perfekt mit V-ing
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Fragende Form
Einfache Form
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Form mit V-ing
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Perfekt
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Perfekt mit V-ing
could I have been discovering? could you have been discovering? could he have been discovering? could we have been discovering? could you have been discovering? could they have been discovering?
Fragende Negation Form
Einfache Form
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Form mit V-ing
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Perfekt
couldn't I have discovered? couldn't you have discovered? couldn't he have discovered? couldn't we have discovered? couldn't you have discovered? couldn't they have discovered?
Perfekt mit V-ing
couldn't I have been discovering? couldn't you have been discovering? couldn't he have been discovering? couldn't we have been discovering? couldn't you have been discovering? couldn't they have been discovering?