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 can't bobsled you can't bobsled he can't bobsled we can't bobsled you can't bobsled they can't bobsled
V-ing form
I can't be bobsleding you can't be bobsleding he can't be bobsleding we can't be bobsleding you can't be bobsleding they can't be bobsleding
Perfect
I can't have bobsleded you can't have bobsleded he can't have bobsleded we can't have bobsleded you can't have bobsleded they can't have bobsleded
V-ing perfect
I can't have been bobsleding you can't have been bobsleding he can't have been bobsleding we can't have been bobsleding you can't have been bobsleding they can't 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't I bobsled? can't you bobsled? can't he bobsled? can't we bobsled? can't you bobsled? can't they bobsled?
V-ing form
can't I be bobsleding? can't you be bobsleding? can't he be bobsleding? can't we be bobsleding? can't you be bobsleding? can't they be bobsleding?
Perfect
can't I have bobsleded? can't you have bobsleded? can't he have bobsleded? can't we have bobsleded? can't you have bobsleded? can't they have bobsleded?
V-ing perfect
can't I have been bobsleding? can't you have been bobsleding? can't he have been bobsleding? can't we have been bobsleding? can't you have been bobsleding? can't they have been bobsleding?