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Active Voice
Известно present perfect: we have already calculated the transaction costs
Написать: present simple present continuous past simple past perfect past continuous future simple future perfect future continuous

present perfect: - we have already calculated the transaction costs present simple - we calculate the transaction costs. present continuous - we are calculating the transaction costs. past simple - we calculated the transaction costs. past perfect  - we had already calculated the transaction costs.  past continuous -  we were calculating the transaction costs. future simple - we will calculate the transaction costs.  future perfect - we will have already calculated the transaction costs. future continuous - we will be calculating the transaction costs.