He didn't study hard; therefore, he failed the exam. （他学习不努力，因此考试不及格。）

The weather was bad; therefore, we had to cancel our outdoor activity. （天气不好，所以我们不得不取消户外活动。）

She is very talented; therefore, she has won many awards. （她很有才华，因此赢得了很多奖项。）

The road is blocked; therefore, we need to find another route. （道路被堵住了，所以我们得另找一条路。）

He is always late for work; therefore, his boss is very angry with him. （他上班总是迟到，因此他的老板对他很生气。）

The product has many advantages; therefore, it is very popular in the market. （这个产品有很多优点，所以它在市场上很受欢迎。）

They saved a lot of money; therefore, they can afford a new house. （他们存了很多钱，因此能够买得起一套新房子。）

The experiment was successful; therefore, we can move on to the next stage. （实验成功了，所以我们可以进入下一阶段。）

She exercises regularly; therefore, she is in good health. （她经常锻炼，因此身体健康。）

The book is very interesting; therefore, I can't put it down. （这本书非常有趣，所以我爱不释手。）

He made a big mistake; therefore, he had to apologize to everyone. （他犯了一个大错误，因此他不得不向每个人道歉。）

The company improved its service; therefore, it has more customers. （这家公司改善了服务，所以有了更多的客户。）

It was raining heavily; therefore, we stayed at home all day. （雨下得很大，所以我们一整天都待在家里。）

They worked hard; therefore, they achieved great results. （他们努力工作，因此取得了很好的成绩。）

The movie received good reviews; therefore, many people went to see it. （这部电影获得了好评，所以很多人去看了。）

He has a lot of experience; therefore, he is the best person for the job. （他有丰富的经验，因此他是这份工作的最佳人选。）

The rules are clear; therefore, everyone should follow them. （规则很明确，所以每个人都应该遵守。）

She lost her key; therefore, she couldn't enter the house. （她丢了钥匙，因此无法进屋。）

The project requires a lot of time and effort; therefore, we need to plan carefully. （这个项目需要大量的时间和精力，所以我们需要仔细规划。）

The temperature dropped suddenly; therefore, we put on more clothes. （气温突然下降，所以我们多穿了些衣服。）