English verb conjugation
COULD PERVADE

Regular verb: pervade - pervaded - pervaded

Affirmation

Simple form	V-ing form
I could pervade you could pervade he could pervade we could pervade you could pervade they could pervade	I could be pervading you could be pervading he could be pervading we could be pervading you could be pervading they could be pervading
Perfect	V-ing perfect
I could have pervaded you could have pervaded he could have pervaded we could have pervaded you could have pervaded they could have pervaded	I could have been pervading you could have been pervading he could have been pervading we could have been pervading you could have been pervading they could have been pervading

Negation

Simple form	V-ing form
I couldn't pervade you couldn't pervade he couldn't pervade we couldn't pervade you couldn't pervade they couldn't pervade	I couldn't be pervading you couldn't be pervading he couldn't be pervading we couldn't be pervading you couldn't be pervading they couldn't be pervading
Perfect	V-ing perfect
I couldn't have pervaded you couldn't have pervaded he couldn't have pervaded we couldn't have pervaded you couldn't have pervaded they couldn't have pervaded	I couldn't have been pervading you couldn't have been pervading he couldn't have been pervading we couldn't have been pervading you couldn't have been pervading they couldn't have been pervading

Interrogative form

Simple form	V-ing form
could I pervade? could you pervade? could he pervade? could we pervade? could you pervade? could they pervade?	could I be pervading? could you be pervading? could he be pervading? could we be pervading? could you be pervading? could they be pervading?
Perfect	V-ing perfect
could I have pervaded? could you have pervaded? could he have pervaded? could we have pervaded? could you have pervaded? could they have pervaded?	could I have been pervading? could you have been pervading? could he have been pervading? could we have been pervading? could you have been pervading? could they have been pervading?

Interro-negative form

Simple form	V-ing form
couldn't I pervade? couldn't you pervade? couldn't he pervade? couldn't we pervade? couldn't you pervade? couldn't they pervade?	couldn't I be pervading? couldn't you be pervading? couldn't he be pervading? couldn't we be pervading? couldn't you be pervading? couldn't they be pervading?
Perfect	V-ing perfect
couldn't I have pervaded? couldn't you have pervaded? couldn't he have pervaded? couldn't we have pervaded? couldn't you have pervaded? couldn't they have pervaded?	couldn't I have been pervading? couldn't you have been pervading? couldn't he have been pervading? couldn't we have been pervading? couldn't you have been pervading? couldn't they have been pervading?