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I have read some sentences including ''once'' , ''will'' and ''perfect tense''

  1. I will comment on this once I have had a chance to print it out on Monday
  2. I will comment further on this once I have had a chance to fully digest it myself
  3. The date of commencement will be confirmed once people have indicated an interest in taking part

As you see, first part of the sentence includes ''will'' ( future tense), second part is present perfect tense. Is the second part of the sentence not supposed to be present tense?

  1. I will comment on this once I have a chance to print it out on Monday
  2. I will comment further on this once I have a chance to fully digest it myself
  3. The date of commencement will be confirmed once people indicate an interest in taking part

why perfect tense?

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You can replace "once" with "after".

"I will comment on this after I have had a chance to print it out on monday"

After something has happened, you are looking back on it. In the past.

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