Translating as Past or Present tense
Your example describes a series of things happening one after another.  The first and fifth sentences already imply past tense.  This is enough to imply that all things described happened in the past until a word about time is present to change the tense to &quot;now&quot; or &quot;future&quot;.
&quot;了&quot; should not be in every sentence since that creates a ton of duplication which makes the assay inauthentic or ill-written.