Conjugation and declension of "fail" in English
Conjugation of the verb fail[feɪl],
regular 
Indicative
Present Indefinite
Present Continuous
Present Perfect
Present Perfect Continuous
Past Indefinite
Past Continuous
Past Perfect
Past Perfect Continuous
Future Indefinite
Future Continuous
Future Perfect
Future Perfect Continuous
Indicative
Present Indefinite
I don't failyou don't fail
he/she/it doesn't fail
we don't fail
you don't fail
they don't fail
Present Continuous
I am not failingyou aren't failing
he/she/it isn't failing
we aren't failing
you aren't failing
they aren't failing
Present Perfect
I haven't failedyou haven't failed
he/she/it hasn't failed
we haven't failed
you haven't failed
they haven't failed
Present Perfect Continuous
I haven't been failingyou haven't been failing
he/she/it hasn't been failing
we haven't been failing
you haven't been failing
they haven't been failing
Past Indefinite
I didn't failyou didn't fail
he/she/it didn't fail
we didn't fail
you didn't fail
they didn't fail
Past Continuous
I wasn't failingyou weren't failing
he/she/it wasn't failing
we weren't failing
you weren't failing
they weren't failing
Past Perfect
I hadn't failedyou hadn't failed
he/she/it hadn't failed
we hadn't failed
you hadn't failed
they hadn't failed
Past Perfect Continuous
I hadn't been failingyou hadn't been failing
he/she/it hadn't been failing
we hadn't been failing
you hadn't been failing
they hadn't been failing
Future Indefinite
I shan't / won't failyou won't fail
he/she/it won't fail
we shan't / won't fail
you won't fail
they won't fail
Future Continuous
I shan't / won't be failingyou won't be failing
he/she/it won't be failing
we shan't / won't be failing
you won't be failing
they won't be failing
Future Perfect
I shan't / won't have failedyou won't have failed
he/she/it won't have failed
we shan't / won't have failed
you won't have failed
they won't have failed
Future Perfect Continuous
I shan't / won't have been failingyou won't have been failing
he/she/it won't have been failing
we shan't / won't have been failing
you won't have been failing
they won't have been failing
Conditional
Conditional Present
Conditional Present Continuous
Conditional Perfect
Conditional Perfect Continuous
Conditional
Conditional Present
I wouldn't failyou wouldn't fail
he/she/it wouldn't fail
we wouldn't fail
you wouldn't fail
they wouldn't fail
Conditional Present Continuous
I wouldn't be failingyou wouldn't be failing
he/she/it wouldn't be failing
we wouldn't be failing
you wouldn't be failing
they wouldn't be failing
Conditional Perfect
I wouldn't have failedyou wouldn't have failed
he/she/it wouldn't have failed
we wouldn't have failed
you wouldn't have failed
they wouldn't have failed
Conditional Perfect Continuous
I wouldn't have been failingyou wouldn't have been failing
he/she/it wouldn't have been failing
we wouldn't have been failing
you wouldn't have been failing
they wouldn't have been failing
Participles
Present
Past
Infinitives
Infinitives
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Conjugation of English verbs
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