English verb conjugation
COULD PARENTHESISE

Regular verb: parenthesise - parenthesised - parenthesised

Affirmation

Simple form	V-ing form
I could parenthesise you could parenthesise he could parenthesise we could parenthesise you could parenthesise they could parenthesise	I could be parenthesising you could be parenthesising he could be parenthesising we could be parenthesising you could be parenthesising they could be parenthesising
Perfect	V-ing perfect
I could have parenthesised you could have parenthesised he could have parenthesised we could have parenthesised you could have parenthesised they could have parenthesised	I could have been parenthesising you could have been parenthesising he could have been parenthesising we could have been parenthesising you could have been parenthesising they could have been parenthesising

Negation

Simple form	V-ing form
I couldn't parenthesise you couldn't parenthesise he couldn't parenthesise we couldn't parenthesise you couldn't parenthesise they couldn't parenthesise	I couldn't be parenthesising you couldn't be parenthesising he couldn't be parenthesising we couldn't be parenthesising you couldn't be parenthesising they couldn't be parenthesising
Perfect	V-ing perfect
I couldn't have parenthesised you couldn't have parenthesised he couldn't have parenthesised we couldn't have parenthesised you couldn't have parenthesised they couldn't have parenthesised	I couldn't have been parenthesising you couldn't have been parenthesising he couldn't have been parenthesising we couldn't have been parenthesising you couldn't have been parenthesising they couldn't have been parenthesising

Interrogative form

Simple form	V-ing form
could I parenthesise? could you parenthesise? could he parenthesise? could we parenthesise? could you parenthesise? could they parenthesise?	could I be parenthesising? could you be parenthesising? could he be parenthesising? could we be parenthesising? could you be parenthesising? could they be parenthesising?
Perfect	V-ing perfect
could I have parenthesised? could you have parenthesised? could he have parenthesised? could we have parenthesised? could you have parenthesised? could they have parenthesised?	could I have been parenthesising? could you have been parenthesising? could he have been parenthesising? could we have been parenthesising? could you have been parenthesising? could they have been parenthesising?

Interro-negative form

Simple form	V-ing form
couldn't I parenthesise? couldn't you parenthesise? couldn't he parenthesise? couldn't we parenthesise? couldn't you parenthesise? couldn't they parenthesise?	couldn't I be parenthesising? couldn't you be parenthesising? couldn't he be parenthesising? couldn't we be parenthesising? couldn't you be parenthesising? couldn't they be parenthesising?
Perfect	V-ing perfect
couldn't I have parenthesised? couldn't you have parenthesised? couldn't he have parenthesised? couldn't we have parenthesised? couldn't you have parenthesised? couldn't they have parenthesised?	couldn't I have been parenthesising? couldn't you have been parenthesising? couldn't he have been parenthesising? couldn't we have been parenthesising? couldn't you have been parenthesising? couldn't they have been parenthesising?