We use come / look / go / wait / be etc. When we tell somebody to do something.
* Come here and look at this! What is it?
* I don't want to talk to you. Go away!
* I'm not ready yet. Please wait for me.
* Please be quiet. I'm working.
also
* Bye! Have a good holiday! / Have a nice time! / Have a good flight! / Have fun!
(= I hope you have a good holiday etc)
* Have a chocolate. Oh, thanks. (= would you like a chocolate?)
We use don't ... when we tell somebody not to do something:
* Be careful! Don't fall.
* Please don't go. Stay here with me.
* Be here on time. Don't be late.
We use say Let's ... When you want people to do thing with you. Let's = Let us.
* It's a nice day. Let's go out. (= you and I can go out)
* Come on! Let's dance. (= you and I can dance)
* Are you ready? Let's go.
* Let's have fish for dinner tonight.
* A: Shall we go out tonight?
B: No, I'm tired. Let's stay at home.
The negative is Let's not...
* It's cold Let's not go out. Let's stay at home.
* Let's not have fish for dinner tonight. Let's have chicken.
Some sentences are positive (buy / come etc): and some negative (don't buy / don't come etc):
1. Come in!
2. Don't drink the water!
3. It's too expensive don't buy it.
4. OK, are you ready? Smile
5. Don't sit on the cat!
6. Bye! Have a nice time.
7. Don't forget to phone me. = Don't worry. I won't.
8. I'm going to bed now. OK Sleep well.
9. Be careful with that Don't drop vase it!
Make sentences. Use let's with:
Questions and answers:
1. Would you like to play tennis? No, let's go for a swim.
2. Do you want to walk home? No, let's take a taxi.
3. Shall I put a CD on? No, let's watch TV.
4. Shall we eat at home? No, let's go to a restaurant.
5. Would you like to go now? No, let's wait a little.
Answers with No, don't... Or No, let's not...
1. Shall I wait for you? No, don't wait for me.
2. Shall we go home now? No, let's not go home yet.
3. Shall we go out? No, let's not go out.
4. Do you want me to close the window? No, don't close the window.
5. Shall I phone you tonight? No, don't phone me tonight.
6. Do you think we should wait for Andy? No, let's not wait for Andy.
7. Do you want me to turn on the light? No, don't turn on the light.
8. Shall we go by bus? No, let's not go by bus.
