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