+ past participle’ form. The past perfect tense reminds children that an action happened before another event in the past. This is important because it helps students understand facts and events better when answering questions in indirect speech or past perfect tense conversations as an activity. ...
(Past participle 过去分词)am/is/are + v. (p.p.)was/were + v. (p.p.)It is obvious who performs the action.We do not know or do not… who performs the action.It uses a plane to visit poor areas.It helps everyone.Peter Scott designed the famous panda logo.It provides basic ...