I could radiate you could radiate she could radiate we could radiate you could radiate they could radiate
V-ing form
I could be radiating you could be radiating she could be radiating we could be radiating you could be radiating they could be radiating
Perfect
I could have radiated you could have radiated she could have radiated we could have radiated you could have radiated they could have radiated
V-ing perfect
I could have been radiating you could have been radiating she could have been radiating we could have been radiating you could have been radiating they could have been radiating
Negation
Simple form
I couldn't radiate you couldn't radiate she couldn't radiate we couldn't radiate you couldn't radiate they couldn't radiate
V-ing form
I couldn't be radiating you couldn't be radiating she couldn't be radiating we couldn't be radiating you couldn't be radiating they couldn't be radiating
Perfect
I couldn't have radiated you couldn't have radiated she couldn't have radiated we couldn't have radiated you couldn't have radiated they couldn't have radiated
V-ing perfect
I couldn't have been radiating you couldn't have been radiating she couldn't have been radiating we couldn't have been radiating you couldn't have been radiating they couldn't have been radiating
Interrogative form
Simple form
could I radiate? could you radiate? could she radiate? could we radiate? could you radiate? could they radiate?
V-ing form
could I be radiating? could you be radiating? could she be radiating? could we be radiating? could you be radiating? could they be radiating?
Perfect
could I have radiated? could you have radiated? could she have radiated? could we have radiated? could you have radiated? could they have radiated?
V-ing perfect
could I have been radiating? could you have been radiating? could she have been radiating? could we have been radiating? could you have been radiating? could they have been radiating?
Interro-negative form
Simple form
couldn't I radiate? couldn't you radiate? couldn't she radiate? couldn't we radiate? couldn't you radiate? couldn't they radiate?
V-ing form
couldn't I be radiating? couldn't you be radiating? couldn't she be radiating? couldn't we be radiating? couldn't you be radiating? couldn't they be radiating?
Perfect
couldn't I have radiated? couldn't you have radiated? couldn't she have radiated? couldn't we have radiated? couldn't you have radiated? couldn't they have radiated?
V-ing perfect
couldn't I have been radiating? couldn't you have been radiating? couldn't she have been radiating? couldn't we have been radiating? couldn't you have been radiating? couldn't they have been radiating?