I told him many times but he failed ( )(understand)it.

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Itoldhimmanytimesbuthefailed()(understand)it.Itoldhimmanytimesbuthefailed()(understand)it.Itoldhimma

I told him many times but he failed ( )(understand)it.
I told him many times but he failed ( )(understand)it.

I told him many times but he failed ( )(understand)it.
to understand

to understand