English verb conjugation
COULD IMPINGE

Regular verb: impinge - impinged - impinged

Affirmation

Simple form	V-ing form
I could impinge you could impinge she could impinge we could impinge you could impinge they could impinge	I could be impinging you could be impinging she could be impinging we could be impinging you could be impinging they could be impinging
Perfect	V-ing perfect
I could have impinged you could have impinged she could have impinged we could have impinged you could have impinged they could have impinged	I could have been impinging you could have been impinging she could have been impinging we could have been impinging you could have been impinging they could have been impinging

Negation

Simple form	V-ing form
I couldn't impinge you couldn't impinge she couldn't impinge we couldn't impinge you couldn't impinge they couldn't impinge	I couldn't be impinging you couldn't be impinging she couldn't be impinging we couldn't be impinging you couldn't be impinging they couldn't be impinging
Perfect	V-ing perfect
I couldn't have impinged you couldn't have impinged she couldn't have impinged we couldn't have impinged you couldn't have impinged they couldn't have impinged	I couldn't have been impinging you couldn't have been impinging she couldn't have been impinging we couldn't have been impinging you couldn't have been impinging they couldn't have been impinging

Interrogative form

Simple form	V-ing form
could I impinge? could you impinge? could she impinge? could we impinge? could you impinge? could they impinge?	could I be impinging? could you be impinging? could she be impinging? could we be impinging? could you be impinging? could they be impinging?
Perfect	V-ing perfect
could I have impinged? could you have impinged? could she have impinged? could we have impinged? could you have impinged? could they have impinged?	could I have been impinging? could you have been impinging? could she have been impinging? could we have been impinging? could you have been impinging? could they have been impinging?

Interro-negative form

Simple form	V-ing form
couldn't I impinge? couldn't you impinge? couldn't she impinge? couldn't we impinge? couldn't you impinge? couldn't they impinge?	couldn't I be impinging? couldn't you be impinging? couldn't she be impinging? couldn't we be impinging? couldn't you be impinging? couldn't they be impinging?
Perfect	V-ing perfect
couldn't I have impinged? couldn't you have impinged? couldn't she have impinged? couldn't we have impinged? couldn't you have impinged? couldn't they have impinged?	couldn't I have been impinging? couldn't you have been impinging? couldn't she have been impinging? couldn't we have been impinging? couldn't you have been impinging? couldn't they have been impinging?