Hi, loveCZ Until the new software was purchased, the staff had struggled to keep the accounts records up to date. In the above example, "was purchased" this possible past perfect tense is followed by "had struggled" this past perfect tense. My teacher taught me that we use past perfect tense to state something which happened firstly and past tense to something that happened after.
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loveCZUntil the new software was purchased, the staff had struggled to keep the accounts records up to date.
In the above example, "was purchased" this possiblepast perfect tenseis followed by "had struggled" this past perfect tense. My teacher taught me that we use past perfect tense to state something which happened firstly and past tense
loveCZHad + pp = Past Perfect
loveCZ "was done","was brought","was born" are simple pastBoth correct.
Until the new software was purchased [by someone], the staff has struggled to keep the account record up to day.
Was purchased = indirect speed not past perfect in this case.