[3] Talking about activities 谈论活动 

181. What are you doing? 
182. I’m reading a book. 
183. What’s your friend doing? 
184. He’s studying his lesson. 
185. I’m not doing anything right now. 
186. Where are you going? 
187. I’m going home. 
188. What time are you coming back? 
189. I’m not sure what time I’m coming back. 
190. What are you thinking about? 
191. I’m thinking about my lesson. 
192. Who are you writing to? 
193. I’m writing to a friend of mine in South American. 
194. By the way,who are you waiting for? 
195. I’m not waiting for anybody.