I can startle you can startle he can startle we can startle you can startle they can startle
V-ing form
I can be startling you can be startling he can be startling we can be startling you can be startling they can be startling
Perfect
I can have startled you can have startled he can have startled we can have startled you can have startled they can have startled
V-ing perfect
I can have been startling you can have been startling he can have been startling we can have been startling you can have been startling they can have been startling
Negation
Simple form
I can't startle you can't startle he can't startle we can't startle you can't startle they can't startle
V-ing form
I can't be startling you can't be startling he can't be startling we can't be startling you can't be startling they can't be startling
Perfect
I can't have startled you can't have startled he can't have startled we can't have startled you can't have startled they can't have startled
V-ing perfect
I can't have been startling you can't have been startling he can't have been startling we can't have been startling you can't have been startling they can't have been startling
Interrogative form
Simple form
can I startle? can you startle? can he startle? can we startle? can you startle? can they startle?
V-ing form
can I be startling? can you be startling? can he be startling? can we be startling? can you be startling? can they be startling?
Perfect
can I have startled? can you have startled? can he have startled? can we have startled? can you have startled? can they have startled?
V-ing perfect
can I have been startling? can you have been startling? can he have been startling? can we have been startling? can you have been startling? can they have been startling?
Interro-negative form
Simple form
can't I startle? can't you startle? can't he startle? can't we startle? can't you startle? can't they startle?
V-ing form
can't I be startling? can't you be startling? can't he be startling? can't we be startling? can't you be startling? can't they be startling?
Perfect
can't I have startled? can't you have startled? can't he have startled? can't we have startled? can't you have startled? can't they have startled?
V-ing perfect
can't I have been startling? can't you have been startling? can't he have been startling? can't we have been startling? can't you have been startling? can't they have been startling?