English verb conjugation
COULD FERTILISE

Regular verb: fertilise - fertilised - fertilised

Affirmation

Simple form	V-ing form
I could fertilise you could fertilise he could fertilise we could fertilise you could fertilise they could fertilise	I could be fertilising you could be fertilising he could be fertilising we could be fertilising you could be fertilising they could be fertilising
Perfect	V-ing perfect
I could have fertilised you could have fertilised he could have fertilised we could have fertilised you could have fertilised they could have fertilised	I could have been fertilising you could have been fertilising he could have been fertilising we could have been fertilising you could have been fertilising they could have been fertilising

Negation

Simple form	V-ing form
I couldn't fertilise you couldn't fertilise he couldn't fertilise we couldn't fertilise you couldn't fertilise they couldn't fertilise	I couldn't be fertilising you couldn't be fertilising he couldn't be fertilising we couldn't be fertilising you couldn't be fertilising they couldn't be fertilising
Perfect	V-ing perfect
I couldn't have fertilised you couldn't have fertilised he couldn't have fertilised we couldn't have fertilised you couldn't have fertilised they couldn't have fertilised	I couldn't have been fertilising you couldn't have been fertilising he couldn't have been fertilising we couldn't have been fertilising you couldn't have been fertilising they couldn't have been fertilising

Interrogative form

Simple form	V-ing form
could I fertilise? could you fertilise? could he fertilise? could we fertilise? could you fertilise? could they fertilise?	could I be fertilising? could you be fertilising? could he be fertilising? could we be fertilising? could you be fertilising? could they be fertilising?
Perfect	V-ing perfect
could I have fertilised? could you have fertilised? could he have fertilised? could we have fertilised? could you have fertilised? could they have fertilised?	could I have been fertilising? could you have been fertilising? could he have been fertilising? could we have been fertilising? could you have been fertilising? could they have been fertilising?

Interro-negative form

Simple form	V-ing form
couldn't I fertilise? couldn't you fertilise? couldn't he fertilise? couldn't we fertilise? couldn't you fertilise? couldn't they fertilise?	couldn't I be fertilising? couldn't you be fertilising? couldn't he be fertilising? couldn't we be fertilising? couldn't you be fertilising? couldn't they be fertilising?
Perfect	V-ing perfect
couldn't I have fertilised? couldn't you have fertilised? couldn't he have fertilised? couldn't we have fertilised? couldn't you have fertilised? couldn't they have fertilised?	couldn't I have been fertilising? couldn't you have been fertilising? couldn't he have been fertilising? couldn't we have been fertilising? couldn't you have been fertilising? couldn't they have been fertilising?