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“It be+时间”与“since/before/when/that结构在中学英语中出现频率较高,是常考的考点。学生们在使用时容易混淆,把握不好,现将这些句式总结如下:1.It be+段时间since…说明:since从句中谓语用一般过去时,主句用一般现在时或现在完成时(即be为is/has been),常译为”到现在为止干某件事有多长时间了“;since从句中谓语用过去完成时,主句用一般过去时(即be为
”It be+time“ and ”since/before/when/that“ are frequently used in English for middle school and are frequently used as test points. Students are apt to confuse when using, and they are not well grasped. Now these sentences are used. Summarize as follows: 1.It be + time since... Description: When the predicate is used in the since clause of the since clause, when the main sentence is completed with the present-day or present (that is, be is/has been), it is often translated as ”“ How long does it take to do something?”; in the since clause of the since clause, when the predicate is completed in the past, the main sentence uses the ordinary past time (ie, be