English verb conjugation
OUGHT TO STRENGTHEN

Regular verb: strengthen - strengthened - strengthened

Affirmation

Simple form	V-ing form
I ought to strengthen you ought to strengthen she ought to strengthen we ought to strengthen you ought to strengthen they ought to strengthen	I ought to be strengthening you ought to be strengthening she ought to be strengthening we ought to be strengthening you ought to be strengthening they ought to be strengthening
Perfect	V-ing perfect
I ought to have strengthened you ought to have strengthened she ought to have strengthened we ought to have strengthened you ought to have strengthened they ought to have strengthened	I ought to have been strengthening you ought to have been strengthening she ought to have been strengthening we ought to have been strengthening you ought to have been strengthening they ought to have been strengthening

Negation

Simple form	V-ing form
I oughtn't to strengthen you oughtn't to strengthen she oughtn't to strengthen we oughtn't to strengthen you oughtn't to strengthen they oughtn't to strengthen	I oughtn't to be strengthening you oughtn't to be strengthening she oughtn't to be strengthening we oughtn't to be strengthening you oughtn't to be strengthening they oughtn't to be strengthening
Perfect	V-ing perfect
I oughtn't to have strengthened you oughtn't to have strengthened she oughtn't to have strengthened we oughtn't to have strengthened you oughtn't to have strengthened they oughtn't to have strengthened	I oughtn't to have been strengthening you oughtn't to have been strengthening she oughtn't to have been strengthening we oughtn't to have been strengthening you oughtn't to have been strengthening they oughtn't to have been strengthening

Interrogative form

Simple form	V-ing form
ought to I strengthen? ought to you strengthen? ought to she strengthen? ought to we strengthen? ought to you strengthen? ought to they strengthen?	ought to I be strengthening? ought to you be strengthening? ought to she be strengthening? ought to we be strengthening? ought to you be strengthening? ought to they be strengthening?
Perfect	V-ing perfect
ought to I have strengthened? ought to you have strengthened? ought to she have strengthened? ought to we have strengthened? ought to you have strengthened? ought to they have strengthened?	ought to I have been strengthening? ought to you have been strengthening? ought to she have been strengthening? ought to we have been strengthening? ought to you have been strengthening? ought to they have been strengthening?

Interro-negative form

Simple form	V-ing form
oughtn't I to strengthen? oughtn't you to strengthen? oughtn't she to strengthen? oughtn't we to strengthen? oughtn't you to strengthen? oughtn't they to strengthen?	oughtn't I to be strengthening? oughtn't you to be strengthening? oughtn't she to be strengthening? oughtn't we to be strengthening? oughtn't you to be strengthening? oughtn't they to be strengthening?
Perfect	V-ing perfect
oughtn't I to have strengthened? oughtn't you to have strengthened? oughtn't she to have strengthened? oughtn't we to have strengthened? oughtn't you to have strengthened? oughtn't they to have strengthened?	oughtn't I to have been strengthening? oughtn't you to have been strengthening? oughtn't she to have been strengthening? oughtn't we to have been strengthening? oughtn't you to have been strengthening? oughtn't they to have been strengthening?