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Indicative
Present
I 
understand 
you 
understand 
she 
understands 
we 
understand 
they 
understand 
Present perfect
I 
have 
understood 
you 
have 
understood 
she 
has 
understood 
we 
have 
understood 
they 
have 
understood 
Preterit
I 
understood 
you 
understood 
she 
understood 
we 
understood 
they 
understood 
Past perfect
I 
had 
understood 
you 
had 
understood 
she 
had 
understood 
we 
had 
understood 
they 
had 
understood 
Future
I 
will 
understand 
you 
will 
understand 
she 
will 
understand 
we 
will 
understand 
they 
will 
understand 
Future perfect
I 
will 
have 
understood 
you 
will 
have 
understood 
she 
will 
has 
understood 
we 
will 
have 
understood 
they 
will 
have 
understood 
Subjunctive
Present
I 
understand 
you 
understand 
she 
understand 
we 
understand 
they 
understand 
Present perfect
I 
have 
understood 
you 
have 
understood 
she 
have 
understood 
we 
have 
understood 
they 
have 
understood 
Preterit
I 
understood 
you 
understood 
she 
understood 
we 
understood 
they 
understood 
Present perfect
I 
had 
understood 
you 
had 
understood 
she 
had 
understood 
we 
had 
understood 
they 
had 
understood 
Conditional
Present
I 
would 
understand 
you 
would 
understand 
she 
would 
understand 
we 
would 
understand 
they 
would 
understand 
Perfect
I 
would 
have 
understood 
you 
would 
have 
understood 
she 
would 
have 
understood 
we 
would 
have 
understood 
they 
would 
have 
understood 
Imperative
Present

understand! 
let's 
understand! 
Participle
Present participle (Gerund)