Conjugation and declension of "underestimate" in English
Conjugation of the verb underestimate[ʌnd(ə)r'estɪmət],
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 underestimateyou don't underestimate
he/she/it doesn't underestimate
we don't underestimate
you don't underestimate
they don't underestimate
Present Continuous
I am not underestimatingyou aren't underestimating
he/she/it isn't underestimating
we aren't underestimating
you aren't underestimating
they aren't underestimating
Present Perfect
I haven't underestimatedyou haven't underestimated
he/she/it hasn't underestimated
we haven't underestimated
you haven't underestimated
they haven't underestimated
Present Perfect Continuous
I haven't been underestimatingyou haven't been underestimating
he/she/it hasn't been underestimating
we haven't been underestimating
you haven't been underestimating
they haven't been underestimating
Past Indefinite
I didn't underestimateyou didn't underestimate
he/she/it didn't underestimate
we didn't underestimate
you didn't underestimate
they didn't underestimate
Past Continuous
I wasn't underestimatingyou weren't underestimating
he/she/it wasn't underestimating
we weren't underestimating
you weren't underestimating
they weren't underestimating
Past Perfect
I hadn't underestimatedyou hadn't underestimated
he/she/it hadn't underestimated
we hadn't underestimated
you hadn't underestimated
they hadn't underestimated
Past Perfect Continuous
I hadn't been underestimatingyou hadn't been underestimating
he/she/it hadn't been underestimating
we hadn't been underestimating
you hadn't been underestimating
they hadn't been underestimating
Future Indefinite
I shan't / won't underestimateyou won't underestimate
he/she/it won't underestimate
we shan't / won't underestimate
you won't underestimate
they won't underestimate
Future Continuous
I shan't / won't be underestimatingyou won't be underestimating
he/she/it won't be underestimating
we shan't / won't be underestimating
you won't be underestimating
they won't be underestimating
Future Perfect
I shan't / won't have underestimatedyou won't have underestimated
he/she/it won't have underestimated
we shan't / won't have underestimated
you won't have underestimated
they won't have underestimated
Future Perfect Continuous
I shan't / won't have been underestimatingyou won't have been underestimating
he/she/it won't have been underestimating
we shan't / won't have been underestimating
you won't have been underestimating
they won't have been underestimating
Conditional
Conditional Present
Conditional Present Continuous
Conditional Perfect
Conditional Perfect Continuous
Conditional
Conditional Present
I wouldn't underestimateyou wouldn't underestimate
he/she/it wouldn't underestimate
we wouldn't underestimate
you wouldn't underestimate
they wouldn't underestimate
Conditional Present Continuous
I wouldn't be underestimatingyou wouldn't be underestimating
he/she/it wouldn't be underestimating
we wouldn't be underestimating
you wouldn't be underestimating
they wouldn't be underestimating
Conditional Perfect
I wouldn't have underestimatedyou wouldn't have underestimated
he/she/it wouldn't have underestimated
we wouldn't have underestimated
you wouldn't have underestimated
they wouldn't have underestimated
Conditional Perfect Continuous
I wouldn't have been underestimatingyou wouldn't have been underestimating
he/she/it wouldn't have been underestimating
we wouldn't have been underestimating
you wouldn't have been underestimating
they wouldn't have been underestimating
Participles
Present
Past
Infinitives
Infinitives
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