English verb conjugation
COULD PRACTISE

Regular verb: practise - practised - practised

Affirmation

Simple form	V-ing form
I could practise you could practise he could practise we could practise you could practise they could practise	I could be practising you could be practising he could be practising we could be practising you could be practising they could be practising
Perfect	V-ing perfect
I could have practised you could have practised he could have practised we could have practised you could have practised they could have practised	I could have been practising you could have been practising he could have been practising we could have been practising you could have been practising they could have been practising

Negation

Simple form	V-ing form
I couldn't practise you couldn't practise he couldn't practise we couldn't practise you couldn't practise they couldn't practise	I couldn't be practising you couldn't be practising he couldn't be practising we couldn't be practising you couldn't be practising they couldn't be practising
Perfect	V-ing perfect
I couldn't have practised you couldn't have practised he couldn't have practised we couldn't have practised you couldn't have practised they couldn't have practised	I couldn't have been practising you couldn't have been practising he couldn't have been practising we couldn't have been practising you couldn't have been practising they couldn't have been practising

Interrogative form

Simple form	V-ing form
could I practise? could you practise? could he practise? could we practise? could you practise? could they practise?	could I be practising? could you be practising? could he be practising? could we be practising? could you be practising? could they be practising?
Perfect	V-ing perfect
could I have practised? could you have practised? could he have practised? could we have practised? could you have practised? could they have practised?	could I have been practising? could you have been practising? could he have been practising? could we have been practising? could you have been practising? could they have been practising?

Interro-negative form

Simple form	V-ing form
couldn't I practise? couldn't you practise? couldn't he practise? couldn't we practise? couldn't you practise? couldn't they practise?	couldn't I be practising? couldn't you be practising? couldn't he be practising? couldn't we be practising? couldn't you be practising? couldn't they be practising?
Perfect	V-ing perfect
couldn't I have practised? couldn't you have practised? couldn't he have practised? couldn't we have practised? couldn't you have practised? couldn't they have practised?	couldn't I have been practising? couldn't you have been practising? couldn't he have been practising? couldn't we have been practising? couldn't you have been practising? couldn't they have been practising?