Tenses Form | Past Future

1. Past Future Tense
    (+)  S + should/would + V1
    (-)  S + should/would + not + V1
    (?)  Should/Would + S + V1

2. Past Future Continous Tense
    (+)  S + should/would + be + Ving
    (-)  S + should/would + not + be + Ving
    (?)  Should/Would + S + be + Ving

3. Past Future Perfect Tense
    (+)  S + should/would + have + V3
    (-)  S + should/would + not + have V3
    (?)  Should/Would + S + have + V3

4. Past Future Perfect Continous Tense
    (+)  S + should/would + have + been + Ving
    (-)  S + should/would + not + have + been + Ving
    (?)  Should/Would + S + have + been + Ving