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→ dunchee : 書裡這部份)(仍是有美國人說有這樣子使用/遇到) 09/18 09:48
→ dunchee : 我查過的usage books裡頭(比如Webster's Dictionary 09/18 09:48
→ dunchee : of English Usage)頂多只提到這種句型的不可以: 09/18 09:48
→ dunchee : ".... ago since ...."，目前為止我尚未找到有明確 09/18 09:49
→ dunchee : 說不可以的(英文母語學者著作的)usage/grammar 09/18 09:49
→ dunchee : books 用英文寫不代表母語就是英文 兩回事 09/18 09:49
Collins Cobuild English Usage, page 35.
You also do not say that soemthing has been happening 'since three years ago'.
You say that it has been happening for three years.