I can unlace you can unlace he can unlace we can unlace you can unlace they can unlace
V-ing form
I can be unlacing you can be unlacing he can be unlacing we can be unlacing you can be unlacing they can be unlacing
Perfect
I can have unlaced you can have unlaced he can have unlaced we can have unlaced you can have unlaced they can have unlaced
V-ing perfect
I can have been unlacing you can have been unlacing he can have been unlacing we can have been unlacing you can have been unlacing they can have been unlacing
Negation
Simple form
I cannot unlace you cannot unlace he cannot unlace we cannot unlace you cannot unlace they cannot unlace
V-ing form
I cannot be unlacing you cannot be unlacing he cannot be unlacing we cannot be unlacing you cannot be unlacing they cannot be unlacing
Perfect
I cannot have unlaced you cannot have unlaced he cannot have unlaced we cannot have unlaced you cannot have unlaced they cannot have unlaced
V-ing perfect
I cannot have been unlacing you cannot have been unlacing he cannot have been unlacing we cannot have been unlacing you cannot have been unlacing they cannot have been unlacing
Interrogative form
Simple form
can I unlace? can you unlace? can he unlace? can we unlace? can you unlace? can they unlace?
V-ing form
can I be unlacing? can you be unlacing? can he be unlacing? can we be unlacing? can you be unlacing? can they be unlacing?
Perfect
can I have unlaced? can you have unlaced? can he have unlaced? can we have unlaced? can you have unlaced? can they have unlaced?
V-ing perfect
can I have been unlacing? can you have been unlacing? can he have been unlacing? can we have been unlacing? can you have been unlacing? can they have been unlacing?
Interro-negative form
Simple form
can I not unlace? can you not unlace? can he not unlace? can we not unlace? can you not unlace? can they not unlace?
V-ing form
can I not be unlacing? can you not be unlacing? can he not be unlacing? can we not be unlacing? can you not be unlacing? can they not be unlacing?
Perfect
can I not have unlaced? can you not have unlaced? can he not have unlaced? can we not have unlaced? can you not have unlaced? can they not have unlaced?
V-ing perfect
can I not have been unlacing? can you not have been unlacing? can he not have been unlacing? can we not have been unlacing? can you not have been unlacing? can they not have been unlacing?