职称英语--基础精讲班--语法词汇讲义
Practice 1
1．What's this ________ English? It's key.
A with B in C for
with本身代表伴随状况，for本身的意思表示为了，但在职称当中往往结合一个时态来考。
当for和完成时态一起考时，会出现 主语+have/has+done会出现两种情况：一种为since，另一种为for。如果要是since首先要跟过去的时间点，第二要跟过去时的句子。而for要求加一段时间。例句：I have studied English since two thousand。 I have studied English since I was a child。I have studied English for five years。 职称英语--基础精讲班--语法词汇讲义
