摘要： A. Study this example situation:Yesterday Karen and Jim played tennis. They began at 10 o'clock and finished at 11.30. So, at 10.30 they wereplaying tennis.They were playing = 'they were in the middle of playing'. They had not finished playing.Was/were ~ing is the past continuous:I/he/sh 阅读全文

摘要： Simply, we use it to describe what happened before right now.Very often the past simple ends in -ed (regular verbs):In questions and negatives we use did/didn't + infinitive (enjoy/see/go etc.):The past of be (am/is/are) is was/were:Note that we do not use did in negatives and questions with was 阅读全文

摘要： 并不是所有的词动可以用于 present continuous的。Some verbs (for example, know and like) are not action verbs. You cannot say 'I am knowing' or ,they are liking';you can only say 'I know', 'they like'.The following verbs are not normally used in continuous tenses:like love hate want need 阅读全文