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