I don’t understand the difference between #1 & #2 as follows, are they interchangeable? Or there is just a subtle difference between them?
1) I got what I needed from this service.
2) I got what I need from this service.
The difference is simply when you needed (whatever you needed). If the need was satisfied at the time of the service, and therefore did not continue, you needed it. (Your plumbing was not working properly.
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The difference is simply when you needed (whatever you needed).
If the need was satisfied at the time of the service, and therefore did not continue, you needed it. (Your plumbing was not working properly. You needed to have it repaired. It was repaired. You no longer need plumbing repairs.)
If the need continues to provide the satisfaction you were looking for, then you (still