I can bobsled you can bobsled he can bobsled we can bobsled you can bobsled they can bobsled
V-ing form
I can be bobsleding you can be bobsleding he can be bobsleding we can be bobsleding you can be bobsleding they can be bobsleding
Perfect
I can have bobsleded you can have bobsleded he can have bobsleded we can have bobsleded you can have bobsleded they can have bobsleded
V-ing perfect
I can have been bobsleding you can have been bobsleding he can have been bobsleding we can have been bobsleding you can have been bobsleding they can have been bobsleding
Negation
Simple form
I cannot bobsled you cannot bobsled he cannot bobsled we cannot bobsled you cannot bobsled they cannot bobsled
V-ing form
I cannot be bobsleding you cannot be bobsleding he cannot be bobsleding we cannot be bobsleding you cannot be bobsleding they cannot be bobsleding
Perfect
I cannot have bobsleded you cannot have bobsleded he cannot have bobsleded we cannot have bobsleded you cannot have bobsleded they cannot have bobsleded
V-ing perfect
I cannot have been bobsleding you cannot have been bobsleding he cannot have been bobsleding we cannot have been bobsleding you cannot have been bobsleding they cannot have been bobsleding
Interrogative form
Simple form
can I bobsled? can you bobsled? can he bobsled? can we bobsled? can you bobsled? can they bobsled?
V-ing form
can I be bobsleding? can you be bobsleding? can he be bobsleding? can we be bobsleding? can you be bobsleding? can they be bobsleding?
Perfect
can I have bobsleded? can you have bobsleded? can he have bobsleded? can we have bobsleded? can you have bobsleded? can they have bobsleded?
V-ing perfect
can I have been bobsleding? can you have been bobsleding? can he have been bobsleding? can we have been bobsleding? can you have been bobsleding? can they have been bobsleding?
Interro-negative form
Simple form
can I not bobsled? can you not bobsled? can he not bobsled? can we not bobsled? can you not bobsled? can they not bobsled?
V-ing form
can I not be bobsleding? can you not be bobsleding? can he not be bobsleding? can we not be bobsleding? can you not be bobsleding? can they not be bobsleding?
Perfect
can I not have bobsleded? can you not have bobsleded? can he not have bobsleded? can we not have bobsleded? can you not have bobsleded? can they not have bobsleded?
V-ing perfect
can I not have been bobsleding? can you not have been bobsleding? can he not have been bobsleding? can we not have been bobsleding? can you not have been bobsleding? can they not have been bobsleding?