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 can't realise you can't realise she can't realise we can't realise you can't realise they can't realise
V-ing form
I can't be realising you can't be realising she can't be realising we can't be realising you can't be realising they can't be realising
Perfect
I can't have realised you can't have realised she can't have realised we can't have realised you can't have realised they can't have realised
V-ing perfect
I can't have been realising you can't have been realising she can't have been realising we can't have been realising you can't have been realising they can't 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't I realise? can't you realise? can't she realise? can't we realise? can't you realise? can't they realise?
V-ing form
can't I be realising? can't you be realising? can't she be realising? can't we be realising? can't you be realising? can't they be realising?
Perfect
can't I have realised? can't you have realised? can't she have realised? can't we have realised? can't you have realised? can't they have realised?
V-ing perfect
can't I have been realising? can't you have been realising? can't she have been realising? can't we have been realising? can't you have been realising? can't they have been realising?