I can giggle you can giggle he can giggle we can giggle you can giggle they can giggle
V-ing form
I can be giggling you can be giggling he can be giggling we can be giggling you can be giggling they can be giggling
Perfect
I can have giggled you can have giggled he can have giggled we can have giggled you can have giggled they can have giggled
V-ing perfect
I can have been giggling you can have been giggling he can have been giggling we can have been giggling you can have been giggling they can have been giggling
Negation
Simple form
I cannot giggle you cannot giggle he cannot giggle we cannot giggle you cannot giggle they cannot giggle
V-ing form
I cannot be giggling you cannot be giggling he cannot be giggling we cannot be giggling you cannot be giggling they cannot be giggling
Perfect
I cannot have giggled you cannot have giggled he cannot have giggled we cannot have giggled you cannot have giggled they cannot have giggled
V-ing perfect
I cannot have been giggling you cannot have been giggling he cannot have been giggling we cannot have been giggling you cannot have been giggling they cannot have been giggling
Interrogative form
Simple form
can I giggle? can you giggle? can he giggle? can we giggle? can you giggle? can they giggle?
V-ing form
can I be giggling? can you be giggling? can he be giggling? can we be giggling? can you be giggling? can they be giggling?
Perfect
can I have giggled? can you have giggled? can he have giggled? can we have giggled? can you have giggled? can they have giggled?
V-ing perfect
can I have been giggling? can you have been giggling? can he have been giggling? can we have been giggling? can you have been giggling? can they have been giggling?
Interro-negative form
Simple form
can I not giggle? can you not giggle? can he not giggle? can we not giggle? can you not giggle? can they not giggle?
V-ing form
can I not be giggling? can you not be giggling? can he not be giggling? can we not be giggling? can you not be giggling? can they not be giggling?
Perfect
can I not have giggled? can you not have giggled? can he not have giggled? can we not have giggled? can you not have giggled? can they not have giggled?
V-ing perfect
can I not have been giggling? can you not have been giggling? can he not have been giggling? can we not have been giggling? can you not have been giggling? can they not have been giggling?