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Future perfect
I'll have endeavored you'll have endeavored he'll have endeavored we'll have endeavored you'll have endeavored they'll have endeavored
Future perfect continuous
I'll have been endeavoring you'll have been endeavoring he'll have been endeavoring we'll have been endeavoring you'll have been endeavoring they'll have been endeavoring
I'd be endeavoring you'd be endeavoring he'd be endeavoring we'd be endeavoring you'd be endeavoring they'd be endeavoring
Past
I'd have endeavored you'd have endeavored he'd have endeavored we'd have endeavored you'd have endeavored they'd have endeavored
Past continuous
I'd have been endeavoring you'd have been endeavoring he'd have been endeavoring we'd have been endeavoring you'd have been endeavoring they'd have been endeavoring