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have been; left had been; left am; had left come; had left
little white hair some white hair much white hairs a few white hairs
a few white hairs a little white hair some white hair more fifty hair
have been; went had been; went am; had been come; had been
have been, left had been, left am, had left come, had left
Having been worked Working Worked Having worked
have been；left had been；left am；had left come；had left
with which with that as with it
Ten years went by Ten years has passed It is ten years ago There are ten years
had enjoyed was enjoying enjoyed had been enjoying
meet have met met had met
have been; left had been; left am, had left come; had left
had have had were having had had
have been；left had been；left am；had left come；had left
have been; left had been; left am; had left come; had left
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