viết lại câu sau sao cho nghĩa không đổi Playing sports is very useful =>it's.... It is very boring to read books=>reading..... He has built that doll house for five days=>He started..... We began lear...

1. Playing sports is very useful -> It's very useful to play sports. 2. It is very boring to read books -> Reading books is very boring. 3. He has built that doll house for five days -> He started building that doll house five days ago. 4. We began learning English 3 years ago -> We have been learning English for 3 years. 5. He started joining this community activities last month -> He has been joining this community activities since last month. 6. The last time we saw each other was 3 weeks ago -> We haven't seen each other for 3 weeks.