I could mean you could mean he could mean we could mean you could mean they could mean
V-ing form
I could be meaning you could be meaning he could be meaning we could be meaning you could be meaning they could be meaning
Perfect
I could have meant you could have meant he could have meant we could have meant you could have meant they could have meant
V-ing perfect
I could have been meaning you could have been meaning he could have been meaning we could have been meaning you could have been meaning they could have been meaning
Negation
Simple form
I couldn't mean you couldn't mean he couldn't mean we couldn't mean you couldn't mean they couldn't mean
V-ing form
I couldn't be meaning you couldn't be meaning he couldn't be meaning we couldn't be meaning you couldn't be meaning they couldn't be meaning
Perfect
I couldn't have meant you couldn't have meant he couldn't have meant we couldn't have meant you couldn't have meant they couldn't have meant
V-ing perfect
I couldn't have been meaning you couldn't have been meaning he couldn't have been meaning we couldn't have been meaning you couldn't have been meaning they couldn't have been meaning
Interrogative form
Simple form
could I mean? could you mean? could he mean? could we mean? could you mean? could they mean?
V-ing form
could I be meaning? could you be meaning? could he be meaning? could we be meaning? could you be meaning? could they be meaning?
Perfect
could I have meant? could you have meant? could he have meant? could we have meant? could you have meant? could they have meant?
V-ing perfect
could I have been meaning? could you have been meaning? could he have been meaning? could we have been meaning? could you have been meaning? could they have been meaning?
Interro-negative form
Simple form
couldn't I mean? couldn't you mean? couldn't he mean? couldn't we mean? couldn't you mean? couldn't they mean?
V-ing form
couldn't I be meaning? couldn't you be meaning? couldn't he be meaning? couldn't we be meaning? couldn't you be meaning? couldn't they be meaning?
Perfect
couldn't I have meant? couldn't you have meant? couldn't he have meant? couldn't we have meant? couldn't you have meant? couldn't they have meant?
V-ing perfect
couldn't I have been meaning? couldn't you have been meaning? couldn't he have been meaning? couldn't we have been meaning? couldn't you have been meaning? couldn't they have been meaning?