English verb conjugation
COULD SULFONATE

Regular verb: sulfonate - sulfonated - sulfonated

Affirmation

Simple form	V-ing form
I could sulfonate you could sulfonate he could sulfonate we could sulfonate you could sulfonate they could sulfonate	I could be sulfonating you could be sulfonating he could be sulfonating we could be sulfonating you could be sulfonating they could be sulfonating
Perfect	V-ing perfect
I could have sulfonated you could have sulfonated he could have sulfonated we could have sulfonated you could have sulfonated they could have sulfonated	I could have been sulfonating you could have been sulfonating he could have been sulfonating we could have been sulfonating you could have been sulfonating they could have been sulfonating

Negation

Simple form	V-ing form
I couldn't sulfonate you couldn't sulfonate he couldn't sulfonate we couldn't sulfonate you couldn't sulfonate they couldn't sulfonate	I couldn't be sulfonating you couldn't be sulfonating he couldn't be sulfonating we couldn't be sulfonating you couldn't be sulfonating they couldn't be sulfonating
Perfect	V-ing perfect
I couldn't have sulfonated you couldn't have sulfonated he couldn't have sulfonated we couldn't have sulfonated you couldn't have sulfonated they couldn't have sulfonated	I couldn't have been sulfonating you couldn't have been sulfonating he couldn't have been sulfonating we couldn't have been sulfonating you couldn't have been sulfonating they couldn't have been sulfonating

Interrogative form

Simple form	V-ing form
could I sulfonate? could you sulfonate? could he sulfonate? could we sulfonate? could you sulfonate? could they sulfonate?	could I be sulfonating? could you be sulfonating? could he be sulfonating? could we be sulfonating? could you be sulfonating? could they be sulfonating?
Perfect	V-ing perfect
could I have sulfonated? could you have sulfonated? could he have sulfonated? could we have sulfonated? could you have sulfonated? could they have sulfonated?	could I have been sulfonating? could you have been sulfonating? could he have been sulfonating? could we have been sulfonating? could you have been sulfonating? could they have been sulfonating?

Interro-negative form

Simple form	V-ing form
couldn't I sulfonate? couldn't you sulfonate? couldn't he sulfonate? couldn't we sulfonate? couldn't you sulfonate? couldn't they sulfonate?	couldn't I be sulfonating? couldn't you be sulfonating? couldn't he be sulfonating? couldn't we be sulfonating? couldn't you be sulfonating? couldn't they be sulfonating?
Perfect	V-ing perfect
couldn't I have sulfonated? couldn't you have sulfonated? couldn't he have sulfonated? couldn't we have sulfonated? couldn't you have sulfonated? couldn't they have sulfonated?	couldn't I have been sulfonating? couldn't you have been sulfonating? couldn't he have been sulfonating? couldn't we have been sulfonating? couldn't you have been sulfonating? couldn't they have been sulfonating?