I'll be occurring you'll be occurring he'll be occurring we'll be occurring you'll be occurring they'll be occurring
Future perfect
I'll have occurred you'll have occurred he'll have occurred we'll have occurred you'll have occurred they'll have occurred
Future perfect continuous
I'll have been occurring you'll have been occurring he'll have been occurring we'll have been occurring you'll have been occurring they'll have been occurring
I'd be occurring you'd be occurring he'd be occurring we'd be occurring you'd be occurring they'd be occurring
Past
I'd have occurred you'd have occurred he'd have occurred we'd have occurred you'd have occurred they'd have occurred
Past continuous
I'd have been occurring you'd have been occurring he'd have been occurring we'd have been occurring you'd have been occurring they'd have been occurring