1. Some changes have taken place in the past five years. 过去五年发生了很多变化。
2. Great changes will certainly be produced in the international communications. 在国际交流中理所当然会发生很多大的变化。
3. It has increased/decreased from…to… 他已经从…增加/减少到…。
4. The output of July in this factory increased by 15%. 这个工厂7月份产量以增加了15%。