To talk about the past without knowing how to conjugate the Spanish past tense, you can use the verb ACABAR ( to have just)
This can be done in 3 simple steps:
(1) Acabar (in conjugated form)
+
(2) De
+
+
(3) Verb (in infinitive form)
Example: Acabo de vomitar ( I just threw up)
To make an unforgettable image, picture that you made an "ack" sound at a bar (acabar).
I think it might look something like this:
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