I uderstate sthed you uderstate sthed she uderstate sthed we uderstate sthed you uderstate sthed they uderstate sthed
Preterite continuous
I was uderstate sthing you were uderstate sthing she was uderstate sthing we were uderstate sthing you were uderstate sthing they were uderstate sthing
I've been uderstate sthing you've been uderstate sthing she's been uderstate sthing we've been uderstate sthing you've been uderstate sthing they've been uderstate sthing
I'd been uderstate sthing you'd been uderstate sthing she'd been uderstate sthing we'd been uderstate sthing you'd been uderstate sthing they'd been uderstate sthing
I'll be uderstate sthing you'll be uderstate sthing she'll be uderstate sthing we'll be uderstate sthing you'll be uderstate sthing they'll be uderstate sthing
Future perfect
I'll have uderstate sthed you'll have uderstate sthed she'll have uderstate sthed we'll have uderstate sthed you'll have uderstate sthed they'll have uderstate sthed
Future perfect continuous
I'll have been uderstate sthing you'll have been uderstate sthing she'll have been uderstate sthing we'll have been uderstate sthing you'll have been uderstate sthing they'll have been uderstate sthing
I'd be uderstate sthing you'd be uderstate sthing she'd be uderstate sthing we'd be uderstate sthing you'd be uderstate sthing they'd be uderstate sthing
Past
I'd have uderstate sthed you'd have uderstate sthed she'd have uderstate sthed we'd have uderstate sthed you'd have uderstate sthed they'd have uderstate sthed
Past continuous
I'd have been uderstate sthing you'd have been uderstate sthing she'd have been uderstate sthing we'd have been uderstate sthing you'd have been uderstate sthing they'd have been uderstate sthing