Use the appropriate forms of the verbs in brackets ( pr.simple or future simple) to complete the sentenses. 1) i don't know if i (see) you next sunday. i think i (be) out of town. 2) i (stop) and (ask) the way. i (be) not sure we are walking in the right direction. 3) if the situation (not change) , we (lose) the game. 4) if john (arrive) on time , we (not miss) the 5 o'clock bus. 5) they don't know when mr green (return) . 6) if it (rain) , i (not allow) jack to go for walk. 7) i don't think we ( go) out if it (snow) . 8) who (speak) to mr. biggs when he (come)? 9) they (not tell ) you when they are leaving. 10) it's difficult to say if they (finish) the project today.

Here are the sentences completed with the correct forms of the verbs in Present Simple or Future Simple. Exercise Key

1. I don't know if I will see you next Sunday. I think I will be out of town.
2. I will stop and ask the way. I am not sure we are walking in the right direction.
3. If the situation does not change, we will lose the game.
4. If John arrives on time, we will not miss the 5 o'clock bus.
5. They don't know when Mr. Green will return.
6. If it rains, I will not allow Jack to go for a walk.
7. I don't think we will go out if it snows.
8. Who will speak to Mr. Biggs when he comes?
9. They will not tell you when they are leaving.
10. It's difficult to say if they will finish the project today.

Grammar Notes for Clarity

• Conditional Sentences (Type 1): In "if-clauses" referring to the future, we use the Present Simple after "if," while the main clause uses the Future Simple.
  • Example: If it rains (Present), I will stay (Future) home.
• Time Clauses: Similarly, after conjunctions like "when," "as soon as," or "before," we use the Present Simple to describe future actions.
  • Example: When he comes (Present), we will start (Future).
• Object Clauses with "if" and "when": If "if" means "whether" (expressing doubt/uncertainty) or "when" introduces a noun clause (answering "what?"), the Future Simple can be used.
  • Example: I don't know if (whether) he will come.

Would you like me to explain the difference between these rules in more detail?