I can attain you can attain he can attain we can attain you can attain they can attain
V-ing form
I can be attaining you can be attaining he can be attaining we can be attaining you can be attaining they can be attaining
Perfect
I can have attained you can have attained he can have attained we can have attained you can have attained they can have attained
V-ing perfect
I can have been attaining you can have been attaining he can have been attaining we can have been attaining you can have been attaining they can have been attaining
Negation
Simple form
I can't attain you can't attain he can't attain we can't attain you can't attain they can't attain
V-ing form
I can't be attaining you can't be attaining he can't be attaining we can't be attaining you can't be attaining they can't be attaining
Perfect
I can't have attained you can't have attained he can't have attained we can't have attained you can't have attained they can't have attained
V-ing perfect
I can't have been attaining you can't have been attaining he can't have been attaining we can't have been attaining you can't have been attaining they can't have been attaining
Interrogative form
Simple form
can I attain? can you attain? can he attain? can we attain? can you attain? can they attain?
V-ing form
can I be attaining? can you be attaining? can he be attaining? can we be attaining? can you be attaining? can they be attaining?
Perfect
can I have attained? can you have attained? can he have attained? can we have attained? can you have attained? can they have attained?
V-ing perfect
can I have been attaining? can you have been attaining? can he have been attaining? can we have been attaining? can you have been attaining? can they have been attaining?
Interro-negative form
Simple form
can't I attain? can't you attain? can't he attain? can't we attain? can't you attain? can't they attain?
V-ing form
can't I be attaining? can't you be attaining? can't he be attaining? can't we be attaining? can't you be attaining? can't they be attaining?
Perfect
can't I have attained? can't you have attained? can't he have attained? can't we have attained? can't you have attained? can't they have attained?
V-ing perfect
can't I have been attaining? can't you have been attaining? can't he have been attaining? can't we have been attaining? can't you have been attaining? can't they have been attaining?