| 1. | Complete the sentences with the past continuous tense
用过去进行时完成句子。 |
| 2. | Present perfect continuous tense
现在完成进行时 |
| 3. | Past perfect continuous tense
过去完成进行时 |
| 4. | Past future continuous tense
过去将来进行时 |
| 5. | Revising the present / future / past indefinite tense and the present continuous tense
复习一般现在/将来/过去时和现在进行时。 |
| 6. | We use the present continuous tense to talk about things that are happening now
我们使用现在进行时谈论现在正在发生的事情 |
| 7. | Present continuous tense
现在进行时 |
| 8. | Future continuous tense
将来进行时 |
| 9. | Past continuous tense
过去进行时 |
| 10. | Reason : the vocabulary of trees and environment and the relative background knowledge is widely used . the present continuous tense is one of the most important tenses in english language
难点：用采访中列举的大量事实来回答有关树木的问题，能够在日常生活中得到有效的理解和运用。 |
