English verb conjugation
COULD SIBILATE

Regular verb: sibilate - sibilated - sibilated

Affirmation

Simple form	V-ing form
I could sibilate you could sibilate he could sibilate we could sibilate you could sibilate they could sibilate	I could be sibilating you could be sibilating he could be sibilating we could be sibilating you could be sibilating they could be sibilating
Perfect	V-ing perfect
I could have sibilated you could have sibilated he could have sibilated we could have sibilated you could have sibilated they could have sibilated	I could have been sibilating you could have been sibilating he could have been sibilating we could have been sibilating you could have been sibilating they could have been sibilating

Negation

Simple form	V-ing form
I couldn't sibilate you couldn't sibilate he couldn't sibilate we couldn't sibilate you couldn't sibilate they couldn't sibilate	I couldn't be sibilating you couldn't be sibilating he couldn't be sibilating we couldn't be sibilating you couldn't be sibilating they couldn't be sibilating
Perfect	V-ing perfect
I couldn't have sibilated you couldn't have sibilated he couldn't have sibilated we couldn't have sibilated you couldn't have sibilated they couldn't have sibilated	I couldn't have been sibilating you couldn't have been sibilating he couldn't have been sibilating we couldn't have been sibilating you couldn't have been sibilating they couldn't have been sibilating

Interrogative form

Simple form	V-ing form
could I sibilate? could you sibilate? could he sibilate? could we sibilate? could you sibilate? could they sibilate?	could I be sibilating? could you be sibilating? could he be sibilating? could we be sibilating? could you be sibilating? could they be sibilating?
Perfect	V-ing perfect
could I have sibilated? could you have sibilated? could he have sibilated? could we have sibilated? could you have sibilated? could they have sibilated?	could I have been sibilating? could you have been sibilating? could he have been sibilating? could we have been sibilating? could you have been sibilating? could they have been sibilating?

Interro-negative form

Simple form	V-ing form
couldn't I sibilate? couldn't you sibilate? couldn't he sibilate? couldn't we sibilate? couldn't you sibilate? couldn't they sibilate?	couldn't I be sibilating? couldn't you be sibilating? couldn't he be sibilating? couldn't we be sibilating? couldn't you be sibilating? couldn't they be sibilating?
Perfect	V-ing perfect
couldn't I have sibilated? couldn't you have sibilated? couldn't he have sibilated? couldn't we have sibilated? couldn't you have sibilated? couldn't they have sibilated?	couldn't I have been sibilating? couldn't you have been sibilating? couldn't he have been sibilating? couldn't we have been sibilating? couldn't you have been sibilating? couldn't they have been sibilating?