How to use once, when and after

English as a Second Language English Vocabulary, Grammar and Idioms
1

These are rewritten sentences based on: The crop is harvested and then crushed to extract the juice.
WHICH ARE THE RIGHT SENTENCES?

After the crop has been harvested, it is crushed to extract the juice.
or:
After the crop is harvested, it is crushed to extract the juice.

Once the crop has been harvested, it is crushed to extract the juice.
or:
Once the crop is harvested, it is crushed to extract the juice.

When the crop has been harvested, it is crushed to extract the juice.
or:
When the crop is harvested, it is crushed to extract the juice.

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2

All look pretty good, except the last tells me that crushing is part of the harvesting process. It doesn’t contain “After”, “Once”, or “had been” to tell me that the harvesting is completed before the crushing.

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3

Thanks a million, Mr/Mrs. Arinker.

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