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The fossils preserved in the rock strata of the Grand Canyon have accumulated for a billion years and provide an invaluable geologic record.

I wonder why “provide” is not “provided”. I think “provide” has to be provided because there’s “and”. And the verb before “and” is “have provided”

I’ve been understood that a tense of the verb before “and” has to be the same tense as the verb after “and” Or it just has to be only the same type of speech not the same tense ?

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    It's not provided because they contuniue to do the "providing" of records today, in the present. – Tushar Raj Dec 23 '18 at 8:35
  • I’ve been understood that a tense of the verb before “and” and a tense of the verb after “and” has to be the same. I’m sorry. I don’t understand it clearly – Kiw Dec 23 '18 at 8:42
  • "I heard your question and will now try to answer it." See how the tense doesn't always have to be the same? And connects two clauses. They don't have to be in the same tense. – Tushar Raj Dec 23 '18 at 8:48
  • Does it only have to be the same type ? Anyway thank you very much ! – Kiw Dec 23 '18 at 8:49
  • I'm flagging this as off-topic ("belongs on ELL"). Hi Kiw, you may not be aware that our other site English Language Learners is the best place to look for answers on English questions that a fluent speaker would find trivial. If you have a question for ELL, be sure to read their guidance on what you can ask. :-) – Chappo Dec 23 '18 at 11:43
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I don’t think there are rules for this.

Tushnar Raj is correct. The invaluable geologic record continues to the present day. Its ongoing in the present until there comes a point in time that a condition changes it, which leads to the next example.

If I were to say, “…provided an invaluable geologic record”, then the geological record is no longer valuable in the present.

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