I can muscle you can muscle he can muscle we can muscle you can muscle they can muscle
V-ing form
I can be muscling you can be muscling he can be muscling we can be muscling you can be muscling they can be muscling
Perfect
I can have muscled you can have muscled he can have muscled we can have muscled you can have muscled they can have muscled
V-ing perfect
I can have been muscling you can have been muscling he can have been muscling we can have been muscling you can have been muscling they can have been muscling
Negation
Simple form
I cannot muscle you cannot muscle he cannot muscle we cannot muscle you cannot muscle they cannot muscle
V-ing form
I cannot be muscling you cannot be muscling he cannot be muscling we cannot be muscling you cannot be muscling they cannot be muscling
Perfect
I cannot have muscled you cannot have muscled he cannot have muscled we cannot have muscled you cannot have muscled they cannot have muscled
V-ing perfect
I cannot have been muscling you cannot have been muscling he cannot have been muscling we cannot have been muscling you cannot have been muscling they cannot have been muscling
Interrogative form
Simple form
can I muscle? can you muscle? can he muscle? can we muscle? can you muscle? can they muscle?
V-ing form
can I be muscling? can you be muscling? can he be muscling? can we be muscling? can you be muscling? can they be muscling?
Perfect
can I have muscled? can you have muscled? can he have muscled? can we have muscled? can you have muscled? can they have muscled?
V-ing perfect
can I have been muscling? can you have been muscling? can he have been muscling? can we have been muscling? can you have been muscling? can they have been muscling?
Interro-negative form
Simple form
can I not muscle? can you not muscle? can he not muscle? can we not muscle? can you not muscle? can they not muscle?
V-ing form
can I not be muscling? can you not be muscling? can he not be muscling? can we not be muscling? can you not be muscling? can they not be muscling?
Perfect
can I not have muscled? can you not have muscled? can he not have muscled? can we not have muscled? can you not have muscled? can they not have muscled?
V-ing perfect
can I not have been muscling? can you not have been muscling? can he not have been muscling? can we not have been muscling? can you not have been muscling? can they not have been muscling?