English verb conjugation
COULD INTONATE

Regular verb: intonate - intonated - intonated

Affirmation

Simple form	V-ing form
I could intonate you could intonate he could intonate we could intonate you could intonate they could intonate	I could be intonating you could be intonating he could be intonating we could be intonating you could be intonating they could be intonating
Perfect	V-ing perfect
I could have intonated you could have intonated he could have intonated we could have intonated you could have intonated they could have intonated	I could have been intonating you could have been intonating he could have been intonating we could have been intonating you could have been intonating they could have been intonating

Negation

Simple form	V-ing form
I couldn't intonate you couldn't intonate he couldn't intonate we couldn't intonate you couldn't intonate they couldn't intonate	I couldn't be intonating you couldn't be intonating he couldn't be intonating we couldn't be intonating you couldn't be intonating they couldn't be intonating
Perfect	V-ing perfect
I couldn't have intonated you couldn't have intonated he couldn't have intonated we couldn't have intonated you couldn't have intonated they couldn't have intonated	I couldn't have been intonating you couldn't have been intonating he couldn't have been intonating we couldn't have been intonating you couldn't have been intonating they couldn't have been intonating

Interrogative form

Simple form	V-ing form
could I intonate? could you intonate? could he intonate? could we intonate? could you intonate? could they intonate?	could I be intonating? could you be intonating? could he be intonating? could we be intonating? could you be intonating? could they be intonating?
Perfect	V-ing perfect
could I have intonated? could you have intonated? could he have intonated? could we have intonated? could you have intonated? could they have intonated?	could I have been intonating? could you have been intonating? could he have been intonating? could we have been intonating? could you have been intonating? could they have been intonating?

Interro-negative form

Simple form	V-ing form
couldn't I intonate? couldn't you intonate? couldn't he intonate? couldn't we intonate? couldn't you intonate? couldn't they intonate?	couldn't I be intonating? couldn't you be intonating? couldn't he be intonating? couldn't we be intonating? couldn't you be intonating? couldn't they be intonating?
Perfect	V-ing perfect
couldn't I have intonated? couldn't you have intonated? couldn't he have intonated? couldn't we have intonated? couldn't you have intonated? couldn't they have intonated?	couldn't I have been intonating? couldn't you have been intonating? couldn't he have been intonating? couldn't we have been intonating? couldn't you have been intonating? couldn't they have been intonating?