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3、be("是/存在")动词的各种时态变化：
| 一 般 现 在 时 | 一 般 将 来 时 | 现 在 完 成 时 |
| I am…. You are.… He/She/It is…. We/You/They are…. | (I等各人称) will be…. I am He/She/It is going to be… We/You/They are | I have been…. You have been…. She/he/It has been…. We/You/They have been…. |
| 一 般 过 去 时 | 过 去 将 来 时 | 过 去 完 成 时 |
| I was…. You were.… He/She/It was…. We/You/They were…. | (I等各人称) would be…. I was He/She/It was going to be… We/You/They were | I had been…. You had been…. She/he/It had been…. We/You/They had been…. |
注意：句型变化时,
否定句在am /is /are /will /have /has /was /were /had /would 后面加not,而且not都可以缩写为n't (am后面not不可以缩写);
疑问句将am /is /are /will /have /has /was /were /had /would 提前到句首。
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