I can realise you can realise she can realise we can realise you can realise they can realise
V-ing form
I can be realising you can be realising she can be realising we can be realising you can be realising they can be realising
Perfect
I can have realised you can have realised she can have realised we can have realised you can have realised they can have realised
V-ing perfect
I can have been realising you can have been realising she can have been realising we can have been realising you can have been realising they can have been realising
Negation
Simple form
I cannot realise you cannot realise she cannot realise we cannot realise you cannot realise they cannot realise
V-ing form
I cannot be realising you cannot be realising she cannot be realising we cannot be realising you cannot be realising they cannot be realising
Perfect
I cannot have realised you cannot have realised she cannot have realised we cannot have realised you cannot have realised they cannot have realised
V-ing perfect
I cannot have been realising you cannot have been realising she cannot have been realising we cannot have been realising you cannot have been realising they cannot have been realising
Interrogative form
Simple form
can I realise? can you realise? can she realise? can we realise? can you realise? can they realise?
V-ing form
can I be realising? can you be realising? can she be realising? can we be realising? can you be realising? can they be realising?
Perfect
can I have realised? can you have realised? can she have realised? can we have realised? can you have realised? can they have realised?
V-ing perfect
can I have been realising? can you have been realising? can she have been realising? can we have been realising? can you have been realising? can they have been realising?
Interro-negative form
Simple form
can I not realise? can you not realise? can she not realise? can we not realise? can you not realise? can they not realise?
V-ing form
can I not be realising? can you not be realising? can she not be realising? can we not be realising? can you not be realising? can they not be realising?
Perfect
can I not have realised? can you not have realised? can she not have realised? can we not have realised? can you not have realised? can they not have realised?
V-ing perfect
can I not have been realising? can you not have been realising? can she not have been realising? can we not have been realising? can you not have been realising? can they not have been realising?