English verb conjugation
COULD METASTASIZE

Regular verb: metastasize - metastasized - metastasized

Affirmation

Simple form	V-ing form
I could metastasize you could metastasize he could metastasize we could metastasize you could metastasize they could metastasize	I could be metastasizing you could be metastasizing he could be metastasizing we could be metastasizing you could be metastasizing they could be metastasizing
Perfect	V-ing perfect
I could have metastasized you could have metastasized he could have metastasized we could have metastasized you could have metastasized they could have metastasized	I could have been metastasizing you could have been metastasizing he could have been metastasizing we could have been metastasizing you could have been metastasizing they could have been metastasizing

Negation

Simple form	V-ing form
I couldn't metastasize you couldn't metastasize he couldn't metastasize we couldn't metastasize you couldn't metastasize they couldn't metastasize	I couldn't be metastasizing you couldn't be metastasizing he couldn't be metastasizing we couldn't be metastasizing you couldn't be metastasizing they couldn't be metastasizing
Perfect	V-ing perfect
I couldn't have metastasized you couldn't have metastasized he couldn't have metastasized we couldn't have metastasized you couldn't have metastasized they couldn't have metastasized	I couldn't have been metastasizing you couldn't have been metastasizing he couldn't have been metastasizing we couldn't have been metastasizing you couldn't have been metastasizing they couldn't have been metastasizing

Interrogative form

Simple form	V-ing form
could I metastasize? could you metastasize? could he metastasize? could we metastasize? could you metastasize? could they metastasize?	could I be metastasizing? could you be metastasizing? could he be metastasizing? could we be metastasizing? could you be metastasizing? could they be metastasizing?
Perfect	V-ing perfect
could I have metastasized? could you have metastasized? could he have metastasized? could we have metastasized? could you have metastasized? could they have metastasized?	could I have been metastasizing? could you have been metastasizing? could he have been metastasizing? could we have been metastasizing? could you have been metastasizing? could they have been metastasizing?

Interro-negative form

Simple form	V-ing form
couldn't I metastasize? couldn't you metastasize? couldn't he metastasize? couldn't we metastasize? couldn't you metastasize? couldn't they metastasize?	couldn't I be metastasizing? couldn't you be metastasizing? couldn't he be metastasizing? couldn't we be metastasizing? couldn't you be metastasizing? couldn't they be metastasizing?
Perfect	V-ing perfect
couldn't I have metastasized? couldn't you have metastasized? couldn't he have metastasized? couldn't we have metastasized? couldn't you have metastasized? couldn't they have metastasized?	couldn't I have been metastasizing? couldn't you have been metastasizing? couldn't he have been metastasizing? couldn't we have been metastasizing? couldn't you have been metastasizing? couldn't they have been metastasizing?