I have a question as follows:

Fill in the blanks using the most suitable form from the list given below

"All visitors will be asked to register at the front desk prior to _____ the government building."

  1. enter
  2. entering
  3. be entered
  4. entered

I think 1. or 2. can be the correct answer, but can't decide which one is the best. Could anyone tell me which one is the most suitable and why?


1 Answer 1


All visitors will be asked to register at the front desk prior to entering the government building."

Gerunds show the actions as concepts. Ex: Running is neccessary.

Here 'entering' has become a concept which is to be done after registration.

  • Please get a feel for the standard of questions expected on ELU, a site aimed at linguists. This, a question most 12-year-old native speakers would be expected to know the answer to, should be close-voted rather than answered. Left unanswered, if one has not the C-V privilege. // An explanation of the answer would include the fact that 'prior to' takes a noun phrase or an ing-word or ing-clause. Jun 9, 2020 at 11:21
  • 1
    Sorry, I should have used English Language Learners Stack Exchange rather than this site. And thank you for your additional explanation.
    – ikuzak
    Jun 9, 2020 at 11:40

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