English verb conjugation
COULD STRATIFY

Regular verb: stratify - stratified - stratified

Affirmation

Simple form	V-ing form
I could stratify you could stratify she could stratify we could stratify you could stratify they could stratify	I could be stratifying you could be stratifying she could be stratifying we could be stratifying you could be stratifying they could be stratifying
Perfect	V-ing perfect
I could have stratified you could have stratified she could have stratified we could have stratified you could have stratified they could have stratified	I could have been stratifying you could have been stratifying she could have been stratifying we could have been stratifying you could have been stratifying they could have been stratifying

Negation

Simple form	V-ing form
I could not stratify you could not stratify she could not stratify we could not stratify you could not stratify they could not stratify	I could not be stratifying you could not be stratifying she could not be stratifying we could not be stratifying you could not be stratifying they could not be stratifying
Perfect	V-ing perfect
I could not have stratified you could not have stratified she could not have stratified we could not have stratified you could not have stratified they could not have stratified	I could not have been stratifying you could not have been stratifying she could not have been stratifying we could not have been stratifying you could not have been stratifying they could not have been stratifying

Interrogative form

Simple form	V-ing form
could I stratify? could you stratify? could she stratify? could we stratify? could you stratify? could they stratify?	could I be stratifying? could you be stratifying? could she be stratifying? could we be stratifying? could you be stratifying? could they be stratifying?
Perfect	V-ing perfect
could I have stratified? could you have stratified? could she have stratified? could we have stratified? could you have stratified? could they have stratified?	could I have been stratifying? could you have been stratifying? could she have been stratifying? could we have been stratifying? could you have been stratifying? could they have been stratifying?

Interro-negative form

Simple form	V-ing form
could I not stratify? could you not stratify? could she not stratify? could we not stratify? could you not stratify? could they not stratify?	could I not be stratifying? could you not be stratifying? could she not be stratifying? could we not be stratifying? could you not be stratifying? could they not be stratifying?
Perfect	V-ing perfect
could I not have stratified? could you not have stratified? could she not have stratified? could we not have stratified? could you not have stratified? could they not have stratified?	could I not have been stratifying? could you not have been stratifying? could she not have been stratifying? could we not have been stratifying? could you not have been stratifying? could they not have been stratifying?