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