精选优质文档-倾情为你奉上描述时间1. It is (has been)+一段时间+since sb. did sth.2. It/this/that is the first(second) time that sb. have done sth.3. It is +形容词的最高级+that sb. have done sth.4. Hardly/scarcely had sb. done sth. when sb. did sth.5. No sooner had sb. done sth. than sb. did sth.6. It was the first/ last time that sb. had done sth.7. be doing sth. 8. be about to do sth. when sb. did sth.9. have done sth.过去的时间，（过去完成时）10. By the time of +现在的时间， +主句（现在完成时）将来的时间，（
