John was very upset yesterday because he _____ that he ______ his wallet.a.realised / will loseb.realised / had lostc.had realised / lostd.realises / loses

To determine the correct sentence structure, we first need to analyze the options:

1. Option a: realised / will lose

   • This combination is incorrect because "will lose" suggests a future action which does not logically follow a past realization.

2. Option b: realised / had lost

   • This combination is correct as it indicates that at a past time (yesterday), John came to the realization that an action (losing the wallet) had already occurred prior to that time.

3. Option c: had realised / lost

   • This option is somewhat acceptable but less precise; it suggests he realized in the past but does not clearly indicate he made this realization at a specific moment about a prior action.

4. Option d: realises / loses

   • This is incorrect because it suggests a present action, while the context states John was upset yesterday, which is a past situation.

Final Answer

The correct answer is b. realised / had lost. Thus the complete sentence would be: "John was very upset yesterday because he realised that he had lost his wallet."