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