If you the office early, you me to meet you earlier O O O O left / may phone had left / can phone had left / should have phoned didn't leave / must have phoned

Sure, let's analyze each option step by step to determine the correct answer for the sentence:

1. left / may phone

   • "If you left the office early, you may phone me to meet you earlier."
   • This option is grammatically correct and makes sense. It suggests a possible action in the past that allows for a present or future action.

2. had left / can phone

   • "If you had left the office early, you can phone me to meet you earlier."
   • This option is incorrect because it mixes past perfect tense ("had left") with present ability ("can phone"). The correct form should be "could have phoned" to match the past perfect tense.

3. had left / should have phoned

   • "If you had left the office early, you should have phoned me to meet you earlier."
   • This option is grammatically correct and makes sense. It suggests a past hypothetical situation and a past obligation or expectation.

4. didn't leave / must have phoned

   • "If you didn't leave the office early, you must have phoned me to meet you earlier."
   • This option is incorrect because it creates a logical inconsistency. If you didn't leave early, it doesn't logically follow that you must have phoned.

Based on the analysis, the correct answer is:

left / may phone

So the complete sentence is: "If you left the office early, you may phone me to meet you earlier."