牛津译林版高中英语必修二unit1talesoftheunexplainedgrammarandusage2课件内容摘要：
you _____ (swim) in the lake? • How long _____ you ______________ (swim) in the lake? have swum have been swimming 4. We can use either a state verb or an action verb with the present perfect tense but we usually can only use an action verb with the present perfect continuous tense. I have had this camera for five years. state verb I have taken photos of UFOs with this camera. I have been taking photos of UFOs with this camera. action verb action verb 5. We use the present perfect tense, not the present perfect continuous tense, with the word。阅读剩余 0%
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