Put the verbs into the past perfect or the past perfect continuous. they _____________________________(travel) all night and were exhausted. we _____________________________(book) our flight weeks before we left. they __________________________(wait) for hours before their flight was announced. lionel _________________________ (already/be) to nepal twice before he got married. how long ____________________________(you/ look) for jess before you found him? the guide ___________(organise) everything well in advance, so our trip went smoothly. they ___________________________(look forward) to this holiday for years before they finally managed to do it. it ___________________________(snow) for hours and no plane were able to take off.

Below are the completed sentences with the verbs in the past perfect or the past perfect continuous tense.

• They had been travelling all night and were exhausted.
  (Past perfect continuous is used to emphasize the duration of an activity that caused a result in the past.)
• We had booked our flight weeks before we left.
  (Past perfect simple is used for an action completed before another action in the past.)
• They had been waiting for hours before their flight was announced.
  (Past perfect continuous is used for an action that was ongoing up until a specific point in the past.)
• Lionel had already been to Nepal twice before he got married.
  (Past perfect simple is used with "already" to show an experience completed before a past event.)
• How long had you been looking for Jess before you found him?
  (Past perfect continuous is used to ask about the duration of an action leading up to a past point.)
• The guide had organised everything well in advance, so our trip went smoothly.
  (Past perfect simple is used for an action that was finished before the trip started.)
• They had been looking forward to this holiday for years before they finally managed to do it.
  (Past perfect continuous is used for a long-term ongoing state or feeling leading up to a past event.)
• It had been snowing for hours and no planes were able to take off.
  (Past perfect continuous is used to describe a continuous weather event that resulted in a past situation.)

Please let me know if you would like to review the specific grammar rules for choosing between these two tenses.