before（之前）.docVIP

before（之前） Before can be connected and the past perfect. The following is the specific content. You can find the answer. A. The past is completed mainly have the following usage: 1. they had done before a certain time or past actions or the state of being. By, in before, when, until etc. the adverbial of time. It is sometime in the past as a starting point, so the past perfect tense is a relatively tense, that is the past. And only at some time in the past or an action when compared to use it. For example: Most of the guests had left when he arrived at the party. when he arrived at the party, he found that most of the guests had left. 2. had done can also indicate an action or a condition before a given time in the past until a time in the past or continue, often with for, since and so on. For example: When Jack arrived, he learned Mary had been away for almost an hour. when Jack arrived, he learned Marie had been away for almost an hour. 3. for the compound sentence: a compound sentence is in the past tense, if another compound sentence expresses the early in the past this action, you need to use the past perfect. For example: Tom flew home, but his father had already died. Tom flew home, but his father had already died. 4. some verbs in the past perfect past said unrealized hopes and plans. The commonly used verbs are hope, expect, suppose, think, want, wish etc.. For example: They had hoped to be able to arrive before ten. they had hoped to be able to arrive before 10. In 5. before, after as, soon as and other clauses, because these conjunctions itself has shown that time has, so can be used to replace the past perfect past tense. For example: Two. The past tense and past perfect tense what is different? 1. in the main usage in different complex sentences (1) used in the object clause. In the main clause predicate object clause in the past tense, past tense can be used, can also be passed. But the two temporal meaning is significantly different. Compare the follo