English verb conjugation
COULD ACHIEVE

Regular verb: achieve - achieved - achieved

Affirmation

Simple form	V-ing form
I could achieve you could achieve he could achieve we could achieve you could achieve they could achieve	I could be achieving you could be achieving he could be achieving we could be achieving you could be achieving they could be achieving
Perfect	V-ing perfect
I could have achieved you could have achieved he could have achieved we could have achieved you could have achieved they could have achieved	I could have been achieving you could have been achieving he could have been achieving we could have been achieving you could have been achieving they could have been achieving

Negation

Simple form	V-ing form
I couldn't achieve you couldn't achieve he couldn't achieve we couldn't achieve you couldn't achieve they couldn't achieve	I couldn't be achieving you couldn't be achieving he couldn't be achieving we couldn't be achieving you couldn't be achieving they couldn't be achieving
Perfect	V-ing perfect
I couldn't have achieved you couldn't have achieved he couldn't have achieved we couldn't have achieved you couldn't have achieved they couldn't have achieved	I couldn't have been achieving you couldn't have been achieving he couldn't have been achieving we couldn't have been achieving you couldn't have been achieving they couldn't have been achieving

Interrogative form

Simple form	V-ing form
could I achieve? could you achieve? could he achieve? could we achieve? could you achieve? could they achieve?	could I be achieving? could you be achieving? could he be achieving? could we be achieving? could you be achieving? could they be achieving?
Perfect	V-ing perfect
could I have achieved? could you have achieved? could he have achieved? could we have achieved? could you have achieved? could they have achieved?	could I have been achieving? could you have been achieving? could he have been achieving? could we have been achieving? could you have been achieving? could they have been achieving?

Interro-negative form

Simple form	V-ing form
couldn't I achieve? couldn't you achieve? couldn't he achieve? couldn't we achieve? couldn't you achieve? couldn't they achieve?	couldn't I be achieving? couldn't you be achieving? couldn't he be achieving? couldn't we be achieving? couldn't you be achieving? couldn't they be achieving?
Perfect	V-ing perfect
couldn't I have achieved? couldn't you have achieved? couldn't he have achieved? couldn't we have achieved? couldn't you have achieved? couldn't they have achieved?	couldn't I have been achieving? couldn't you have been achieving? couldn't he have been achieving? couldn't we have been achieving? couldn't you have been achieving? couldn't they have been achieving?