giải giúp mình bài này với

1. We are going to Hanoi. We will come to see you $\rightarrow$ As soon as we get to Hanoi, we will come to see you. 2. It's going to start raining. Let's go out before that. $\rightarrow$ Let's go out before it starts raining. 3. He will have a birthday party soon. He will invite his friends. $\rightarrow$ He will invite his friends before the birthday party. 4. Robert was doing the examination. He suddenly began to feel ill during the examination. $\rightarrow$ Robert began to feel ill while he was doing the examination. 5. The doorbell rang, I climbed the stairs. $\rightarrow$ While I was climbing the stairs, the doorbell rang. 6. I left school (3 years ago). I haven't met them since then. $\rightarrow$ Since I left school three years ago, I haven't met them. 7. We got home and soon after that it started to rain. $\rightarrow$ No sooner had we got home than it started to rain. 8. He had done his homework. Then he went to bed. $\rightarrow$ After he had done his homework, he went to bed. 9.--Before...............................................................$\rightarrow$ Before you leave, you must visit Ha Long Bay. 10.I last met him when he borrowed some money from me.$\rightarrow$I haven't seen him since he borrowed some money from me. 11.I'll find somewhere to live.Then I'll give you my address.$\rightarrow$I'll give you my address when I find somewhere to live. 12.We'll make our decision.Then we'll let you know.$\rightarrowWe'll let you know as soon as we make our decision. 13.You are going to leave soon.You must visit Ha Long Bay before that.$\rightarrowYou must visit Ha Long Bay before you leave. Hy vọng rằng những giải thích trên sẽ giúp bạn hiểu rõ hơn về cách sử dụng các trạng ngữ chỉ TG trong tiếng Anh!