We have cooperated ( ) each other nicely all these years.

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have；has have；have has；has has；have

had been； have met have been； have met had been； had met have been； had met

Before have we never seen each other Never before we have seen each other Each other have we seen never before Never before have we seen each other

had been; have met have been; have met had been; had met have been; had met

renew recall recover refine

knew have known have known know

in for with against

had been； have met have been； have met had been； had met have been； had met

had been; have seen have been; have seen had been; had seen have been; had seen

Before have we never seen each other Never before we have seen each other Each other have We seen never before Never before have we seen each other

have, have has, have has, has have, has

had been； have met    have been； have met
   had been； had met    have been； had met

had been; have seen have been; have seen had been; had seen have been; had seen

had been； have met have been； have met had been； had met have been； had met

had been; have seen have been; have seen had been; had seen have been; had seen

had been; have seen have been; have seen have been; had seen had been; had seen

every other days every three days every other day each two days

could have will not have could not have have not

have; have has; have has; has have; has