I could meditate you could meditate she could meditate we could meditate you could meditate they could meditate
V-ing form
I could be meditating you could be meditating she could be meditating we could be meditating you could be meditating they could be meditating
Perfect
I could have meditated you could have meditated she could have meditated we could have meditated you could have meditated they could have meditated
V-ing perfect
I could have been meditating you could have been meditating she could have been meditating we could have been meditating you could have been meditating they could have been meditating
Negation
Simple form
I could not meditate you could not meditate she could not meditate we could not meditate you could not meditate they could not meditate
V-ing form
I could not be meditating you could not be meditating she could not be meditating we could not be meditating you could not be meditating they could not be meditating
Perfect
I could not have meditated you could not have meditated she could not have meditated we could not have meditated you could not have meditated they could not have meditated
V-ing perfect
I could not have been meditating you could not have been meditating she could not have been meditating we could not have been meditating you could not have been meditating they could not have been meditating
Interrogative form
Simple form
could I meditate? could you meditate? could she meditate? could we meditate? could you meditate? could they meditate?
V-ing form
could I be meditating? could you be meditating? could she be meditating? could we be meditating? could you be meditating? could they be meditating?
Perfect
could I have meditated? could you have meditated? could she have meditated? could we have meditated? could you have meditated? could they have meditated?
V-ing perfect
could I have been meditating? could you have been meditating? could she have been meditating? could we have been meditating? could you have been meditating? could they have been meditating?
Interro-negative form
Simple form
could I not meditate? could you not meditate? could she not meditate? could we not meditate? could you not meditate? could they not meditate?
V-ing form
could I not be meditating? could you not be meditating? could she not be meditating? could we not be meditating? could you not be meditating? could they not be meditating?
Perfect
could I not have meditated? could you not have meditated? could she not have meditated? could we not have meditated? could you not have meditated? could they not have meditated?
V-ing perfect
could I not have been meditating? could you not have been meditating? could she not have been meditating? could we not have been meditating? could you not have been meditating? could they not have been meditating?