English verb conjugation
COULD EXPERIMENT

Regular verb: experiment - experimented - experimented

Affirmation

Simple form	V-ing form
I could experiment you could experiment he could experiment we could experiment you could experiment they could experiment	I could be experimenting you could be experimenting he could be experimenting we could be experimenting you could be experimenting they could be experimenting
Perfect	V-ing perfect
I could have experimented you could have experimented he could have experimented we could have experimented you could have experimented they could have experimented	I could have been experimenting you could have been experimenting he could have been experimenting we could have been experimenting you could have been experimenting they could have been experimenting

Negation

Simple form	V-ing form
I couldn't experiment you couldn't experiment he couldn't experiment we couldn't experiment you couldn't experiment they couldn't experiment	I couldn't be experimenting you couldn't be experimenting he couldn't be experimenting we couldn't be experimenting you couldn't be experimenting they couldn't be experimenting
Perfect	V-ing perfect
I couldn't have experimented you couldn't have experimented he couldn't have experimented we couldn't have experimented you couldn't have experimented they couldn't have experimented	I couldn't have been experimenting you couldn't have been experimenting he couldn't have been experimenting we couldn't have been experimenting you couldn't have been experimenting they couldn't have been experimenting

Interrogative form

Simple form	V-ing form
could I experiment? could you experiment? could he experiment? could we experiment? could you experiment? could they experiment?	could I be experimenting? could you be experimenting? could he be experimenting? could we be experimenting? could you be experimenting? could they be experimenting?
Perfect	V-ing perfect
could I have experimented? could you have experimented? could he have experimented? could we have experimented? could you have experimented? could they have experimented?	could I have been experimenting? could you have been experimenting? could he have been experimenting? could we have been experimenting? could you have been experimenting? could they have been experimenting?

Interro-negative form

Simple form	V-ing form
couldn't I experiment? couldn't you experiment? couldn't he experiment? couldn't we experiment? couldn't you experiment? couldn't they experiment?	couldn't I be experimenting? couldn't you be experimenting? couldn't he be experimenting? couldn't we be experimenting? couldn't you be experimenting? couldn't they be experimenting?
Perfect	V-ing perfect
couldn't I have experimented? couldn't you have experimented? couldn't he have experimented? couldn't we have experimented? couldn't you have experimented? couldn't they have experimented?	couldn't I have been experimenting? couldn't you have been experimenting? couldn't he have been experimenting? couldn't we have been experimenting? couldn't you have been experimenting? couldn't they have been experimenting?